2600665645 has 8 divisors (see below), whose sum is σ = 3121776504. Its totient is φ = 2079880704.

The previous prime is 2600665621. The next prime is 2600665649. The reversal of 2600665645 is 5465660062.

It can be written as a sum of positive squares in 4 ways, for example, as 58690921 + 2541974724 = 7661^2 + 50418^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2600665645 - 2⁷ = 2600665517 is a prime.

It is a super-3 number, since 3×2600665645³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2600665598 and 2600665607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2600665649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63564 + ... + 96133.

It is an arithmetic number, because the mean of its divisors is an integer number (390222063).

Almost surely, 2^2600665645 is an apocalyptic number.

It is an amenable number.

2600665645 is a deficient number, since it is larger than the sum of its proper divisors (521110859).

2600665645 is a wasteful number, since it uses less digits than its factorization.

2600665645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162959.

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 2600665645 is about 50996.7219044519. The cubic root of 2600665645 is about 1375.1862042043.

The spelling of 2600665645 in words is "two billion, six hundred million, six hundred sixty-five thousand, six hundred forty-five".