15517896161 has 4 divisors (see below), whose sum is σ = 15518452992. Its totient is φ = 15517339332.

The previous prime is 15517896133. The next prime is 15517896181. The reversal of 15517896161 is 16169871551.

It is a happy number.

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: 16169871551 = 41 ⋅394387111.

It is a cyclic number.

It is not a de Polignac number, because 15517896161 - 2²² = 15513701857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15517896101) 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, 234281 + ... + 293126.

It is an arithmetic number, because the mean of its divisors is an integer number (3879613248).

Almost surely, 2^15517896161 is an apocalyptic number.

It is an amenable number.

15517896161 is a deficient number, since it is larger than the sum of its proper divisors (556831).

15517896161 is an equidigital number, since it uses as much as digits as its factorization.

15517896161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556830.

The product of its digits is 453600, while the sum is 50.

The spelling of 15517896161 in words is "fifteen billion, five hundred seventeen million, eight hundred ninety-six thousand, one hundred sixty-one".