15972572165 has 16 divisors (see below), whose sum is σ = 20966549760. Its totient is φ = 11584749120.

The previous prime is 15972572159. The next prime is 15972572197. The reversal of 15972572165 is 56127527951.

It is not a de Polignac number, because 15972572165 - 2¹² = 15972568069 is a prime.

It is a super-2 number, since 2×15972572165² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 375470 + ... + 415839.

It is an arithmetic number, because the mean of its divisors is an integer number (1310409360).

Almost surely, 2^15972572165 is an apocalyptic number.

It is an amenable number.

15972572165 is a deficient number, since it is larger than the sum of its proper divisors (4993977595).

15972572165 is a wasteful number, since it uses less digits than its factorization.

15972572165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791692.

The product of its digits is 1323000, while the sum is 50.

The spelling of 15972572165 in words is "fifteen billion, nine hundred seventy-two million, five hundred seventy-two thousand, one hundred sixty-five".