12500151561 has 24 divisors (see below), whose sum is σ = 19777123080. Its totient is φ = 7572773376.

The previous prime is 12500151553. The next prime is 12500151563. The reversal of 12500151561 is 16515100521.

12500151561 is a `hidden beast` number, since 1 + 2 + 50 + 0 + 1 + 51 + 561 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4060238400 + 8439913161 = 63720^2 + 91869^2 .

It is not a de Polignac number, because 12500151561 - 2³ = 12500151553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12500151563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1404190 + ... + 1413063.

It is an arithmetic number, because the mean of its divisors is an integer number (824046795).

Almost surely, 2^12500151561 is an apocalyptic number.

It is an amenable number.

12500151561 is a deficient number, since it is larger than the sum of its proper divisors (7276971519).

12500151561 is a wasteful number, since it uses less digits than its factorization.

12500151561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2817305 (or 2817302 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

The spelling of 12500151561 in words is "twelve billion, five hundred million, one hundred fifty-one thousand, five hundred sixty-one".