| Base | Representation |
|---|---|
| bin | 1001110110110001… |
| … | …1010101101010000 |
| 3 | 20211101021210100100 |
| 4 | 2131230122231100 |
| 5 | 20404242313030 |
| 6 | 1114305452400 |
| 7 | 122363536551 |
| oct | 23554325520 |
| 9 | 6741253310 |
| 10 | 2645666640 |
| 11 | 1138456561 |
| 12 | 61a041100 |
| 13 | 332171b26 |
| 14 | 1b152c328 |
| 15 | 107401360 |
| hex | 9db1ab50 |
2645666640 has 60 divisors (see below), whose sum is σ = 8885032884. Its totient is φ = 705510912.
The previous prime is 2645666603. The next prime is 2645666641. The reversal of 2645666640 is 466665462.
2645666640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It can be written as a sum of positive squares in 2 ways, for example, as 2049916176 + 595750464 = 45276^2 + 24408^2 .
It is a tau number, because it is divible by the number of its divisors (60).
It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.
It is a Harshad number since it is a multiple of its sum of digits (45).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2645666641) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1836549 + ... + 1837988.
Almost surely, 22645666640 is an apocalyptic number.
2645666640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
2645666640 is an abundant number, since it is smaller than the sum of its proper divisors (6239366244).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
2645666640 is a wasteful number, since it uses less digits than its factorization.
2645666640 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3674556 (or 3674547 counting only the distinct ones).
The product of its (nonzero) digits is 1244160, while the sum is 45.
The square root of 2645666640 is about 51436.0441713785. The cubic root of 2645666640 is about 1383.0727999535.
It can be divided in two parts, 26456 and 66640, that added together give a triangular number (93096 = T431).
The spelling of 2645666640 in words is "two billion, six hundred forty-five million, six hundred sixty-six thousand, six hundred forty".
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