12561559308 has 18 divisors (see below), whose sum is σ = 31752830564. Its totient is φ = 4187186424.

The previous prime is 12561559291. The next prime is 12561559313. The reversal of 12561559308 is 80395516521.

12561559308 is a `hidden beast` number, since 1 + 2 + 5 + 61 + 559 + 30 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

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, 174466066 + ... + 174466137.

Almost surely, 2^12561559308 is an apocalyptic number.

12561559308 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12561559308 is an abundant number, since it is smaller than the sum of its proper divisors (19191271256).

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

12561559308 is a wasteful number, since it uses less digits than its factorization.

12561559308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348932213 (or 348932208 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The spelling of 12561559308 in words is "twelve billion, five hundred sixty-one million, five hundred fifty-nine thousand, three hundred eight".