15997074665 has 32 divisors (see below), whose sum is σ = 22563225216. Its totient is φ = 10734197760.

The previous prime is 15997074631. The next prime is 15997074679. The reversal of 15997074665 is 56647079951.

It is not a de Polignac number, because 15997074665 - 2²⁶ = 15929965801 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2067494 + ... + 2075216.

It is an arithmetic number, because the mean of its divisors is an integer number (705100788).

Almost surely, 2^15997074665 is an apocalyptic number.

It is an amenable number.

15997074665 is a deficient number, since it is larger than the sum of its proper divisors (6566150551).

15997074665 is a wasteful number, since it uses less digits than its factorization.

15997074665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10649.

The product of its (nonzero) digits is 14288400, while the sum is 59.

The spelling of 15997074665 in words is "fifteen billion, nine hundred ninety-seven million, seventy-four thousand, six hundred sixty-five".