15131721510965 has 16 divisors (see below), whose sum is σ = 18581134459008. Its totient is φ = 11823355325376.

The previous prime is 15131721510953. The next prime is 15131721510989. The reversal of 15131721510965 is 56901512713151.

It is a cyclic number.

It is not a de Polignac number, because 15131721510965 - 2²⁸ = 15131453075509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3629279 + ... + 6590531.

It is an arithmetic number, because the mean of its divisors is an integer number (1161320903688).

Almost surely, 2^{15131721510965} is an apocalyptic number.

It is an amenable number.

15131721510965 is a deficient number, since it is larger than the sum of its proper divisors (3449412948043).

15131721510965 is a wasteful number, since it uses less digits than its factorization.

15131721510965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985068.

The product of its (nonzero) digits is 283500, while the sum is 47.

The spelling of 15131721510965 in words is "fifteen trillion, one hundred thirty-one billion, seven hundred twenty-one million, five hundred ten thousand, nine hundred sixty-five".