12641577531 has 16 divisors (see below), whose sum is σ = 18433623168. Its totient is φ = 7642448000.

The previous prime is 12641577527. The next prime is 12641577541. The reversal of 12641577531 is 13577514621.

It is not a de Polignac number, because 12641577531 - 2² = 12641577527 is a prime.

It is a super-2 number, since 2×12641577531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12641577511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 464421 + ... + 490886.

It is an arithmetic number, because the mean of its divisors is an integer number (1152101448).

Almost surely, 2^12641577531 is an apocalyptic number.

12641577531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12641577531 is a deficient number, since it is larger than the sum of its proper divisors (5792045637).

12641577531 is a wasteful number, since it uses less digits than its factorization.

12641577531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955722.

The product of its digits is 176400, while the sum is 42.

The spelling of 12641577531 in words is "twelve billion, six hundred forty-one million, five hundred seventy-seven thousand, five hundred thirty-one".