12561525387 has 16 divisors (see below), whose sum is σ = 18614970880. Its totient is φ = 8371963656.

The previous prime is 12561525377. The next prime is 12561525401. The reversal of 12561525387 is 78352516521.

12561525387 is a `hidden beast` number, since 1 + 2 + 5 + 61 + 52 + 538 + 7 = 666.

It is not a de Polignac number, because 12561525387 - 2²⁰ = 12560476811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12561525377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32898 + ... + 161880.

It is an arithmetic number, because the mean of its divisors is an integer number (1163435680).

Almost surely, 2^12561525387 is an apocalyptic number.

12561525387 is a deficient number, since it is larger than the sum of its proper divisors (6053445493).

12561525387 is a wasteful number, since it uses less digits than its factorization.

12561525387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132599 (or 132593 counting only the distinct ones).

The product of its digits is 504000, while the sum is 45.

The spelling of 12561525387 in words is "twelve billion, five hundred sixty-one million, five hundred twenty-five thousand, three hundred eighty-seven".