15794781012865 has 16 divisors (see below), whose sum is σ = 20818750262400. Its totient is φ = 11450312641152.

The previous prime is 15794781012833. The next prime is 15794781012893. The reversal of 15794781012865 is 56821018749751.

It is a cyclic number.

It is not a de Polignac number, because 15794781012865 - 2⁵ = 15794781012833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15794781012797 and 15794781012806.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3614364180 + ... + 3614368549.

It is an arithmetic number, because the mean of its divisors is an integer number (1301171891400).

Almost surely, 2^{15794781012865} is an apocalyptic number.

It is an amenable number.

15794781012865 is a deficient number, since it is larger than the sum of its proper divisors (5023969249535).

15794781012865 is a wasteful number, since it uses less digits than its factorization.

15794781012865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7228732776.

The product of its (nonzero) digits is 33868800, while the sum is 64.

The spelling of 15794781012865 in words is "fifteen trillion, seven hundred ninety-four billion, seven hundred eighty-one million, twelve thousand, eight hundred sixty-five".