15656931149 has 4 divisors (see below), whose sum is σ = 15658678464. Its totient is φ = 15655183836.

The previous prime is 15656931107. The next prime is 15656931161. The reversal of 15656931149 is 94113965651.

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: 94113965651 = 20219 ⋅4654729.

It is a cyclic number.

It is not a de Polignac number, because 15656931149 - 2²⁴ = 15640153933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15656931097 and 15656931106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15656921149) 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, 860147 + ... + 878160.

It is an arithmetic number, because the mean of its divisors is an integer number (3914669616).

Almost surely, 2^15656931149 is an apocalyptic number.

It is an amenable number.

15656931149 is a deficient number, since it is larger than the sum of its proper divisors (1747315).

15656931149 is an equidigital number, since it uses as much as digits as its factorization.

15656931149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747314.

The product of its digits is 874800, while the sum is 50.

The spelling of 15656931149 in words is "fifteen billion, six hundred fifty-six million, nine hundred thirty-one thousand, one hundred forty-nine".