12791022765 has 16 divisors (see below), whose sum is σ = 20964799296. Its totient is φ = 6655491200.

The previous prime is 12791022749. The next prime is 12791022791. The reversal of 12791022765 is 56722019721.

It is not a de Polignac number, because 12791022765 - 2⁴ = 12791022749 is a prime.

It is a super-2 number, since 2×12791022765² (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 (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10398591 + ... + 10399820.

It is an arithmetic number, because the mean of its divisors is an integer number (1310299956).

Almost surely, 2^12791022765 is an apocalyptic number.

12791022765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12791022765 is a deficient number, since it is larger than the sum of its proper divisors (8173776531).

12791022765 is a wasteful number, since it uses less digits than its factorization.

12791022765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20798460.

The product of its (nonzero) digits is 105840, while the sum is 42.

The spelling of 12791022765 in words is "twelve billion, seven hundred ninety-one million, twenty-two thousand, seven hundred sixty-five".