12576551056 has 20 divisors (see below), whose sum is σ = 24582708972. Its totient is φ = 6232626176.

The previous prime is 12576550999. The next prime is 12576551059. The reversal of 12576551056 is 65015567521.

It can be written as a sum of positive squares in 2 ways, for example, as 303456400 + 12273094656 = 17420^2 + 110784^2 .

It is not an unprimeable number, because it can be changed into a prime (12576551059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3476221 + ... + 3479836.

Almost surely, 2^12576551056 is an apocalyptic number.

12576551056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12576551056 is a deficient number, since it is larger than the sum of its proper divisors (12006157916).

12576551056 is a wasteful number, since it uses less digits than its factorization.

12576551056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6956178 (or 6956172 counting only the distinct ones).

The product of its (nonzero) digits is 315000, while the sum is 43.

The spelling of 12576551056 in words is "twelve billion, five hundred seventy-six million, five hundred fifty-one thousand, fifty-six".