12520561311 has 20 divisors (see below), whose sum is σ = 18774702672. Its totient is φ = 8315288928.

The previous prime is 12520561303. The next prime is 12520561327. The reversal of 12520561311 is 11316502521.

12520561311 is a `hidden beast` number, since 1 + 2 + 520 + 5 + 6 + 131 + 1 = 666.

It is not a de Polignac number, because 12520561311 - 2³ = 12520561303 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12520561111) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 272566 + ... + 315171.

Almost surely, 2^12520561311 is an apocalyptic number.

12520561311 is a deficient number, since it is larger than the sum of its proper divisors (6254141361).

12520561311 is an equidigital number, since it uses as much as digits as its factorization.

12520561311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588012 (or 588003 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The spelling of 12520561311 in words is "twelve billion, five hundred twenty million, five hundred sixty-one thousand, three hundred eleven".