12656531600 has 30 divisors (see below), whose sum is σ = 30407318130. Its totient is φ = 5062612480.

The previous prime is 12656531597. The next prime is 12656531627. The reversal of 12656531600 is 613565621.

It can be written as a sum of positive squares in 3 ways, for example, as 724901776 + 11931629824 = 26924^2 + 109232^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15820265 + ... + 15821064.

It is an arithmetic number, because the mean of its divisors is an integer number (1013577271).

Almost surely, 2^12656531600 is an apocalyptic number.

12656531600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12656531600 is an abundant number, since it is smaller than the sum of its proper divisors (17750786530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12656531600 is a wasteful number, since it uses less digits than its factorization.

12656531600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31641347 (or 31641336 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 12656531600 in words is "twelve billion, six hundred fifty-six million, five hundred thirty-one thousand, six hundred".