Base | Representation |
---|---|
bin | 10010010011111010… |
… | …001100111111011101 |
3 | 1212202020100110111201 |
4 | 102103322030333131 |
5 | 310231303040001 |
6 | 13010551315501 |
7 | 1264140644203 |
oct | 222372147735 |
9 | 55666313451 |
10 | 19661377501 |
11 | 837a375a17 |
12 | 398867bb91 |
13 | 1b144a62ac |
14 | d4733b073 |
15 | 7a117d501 |
hex | 493e8cfdd |
19661377501 has 4 divisors (see below), whose sum is σ = 19802826400. Its totient is φ = 19519928604.
The previous prime is 19661377487. The next prime is 19661377531. The reversal of 19661377501 is 10577316691.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10577316691 = 48131 ⋅219761.
It is a cyclic number.
It is not a de Polignac number, because 19661377501 - 25 = 19661377469 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (19661377531) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70724241 + ... + 70724518.
It is an arithmetic number, because the mean of its divisors is an integer number (4950706600).
Almost surely, 219661377501 is an apocalyptic number.
It is an amenable number.
19661377501 is a deficient number, since it is larger than the sum of its proper divisors (141448899).
19661377501 is a wasteful number, since it uses less digits than its factorization.
19661377501 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 141448898.
The product of its (nonzero) digits is 238140, while the sum is 46.
The spelling of 19661377501 in words is "nineteen billion, six hundred sixty-one million, three hundred seventy-seven thousand, five hundred one".
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