12256515771 has 32 divisors (see below), whose sum is σ = 16892428800. Its totient is φ = 7898881536.

The previous prime is 12256515767. The next prime is 12256515773. The reversal of 12256515771 is 17751565221.

It is not a de Polignac number, because 12256515771 - 2² = 12256515767 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12256515773) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20461330 + ... + 20461928.

It is an arithmetic number, because the mean of its divisors is an integer number (527888400).

Almost surely, 2^12256515771 is an apocalyptic number.

12256515771 is a deficient number, since it is larger than the sum of its proper divisors (4635913029).

12256515771 is a wasteful number, since it uses less digits than its factorization.

12256515771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523.

The product of its digits is 147000, while the sum is 42.

The spelling of 12256515771 in words is "twelve billion, two hundred fifty-six million, five hundred fifteen thousand, seven hundred seventy-one".