12686521800 has 48 divisors (see below), whose sum is σ = 39328219440. Its totient is φ = 3383072320.

The previous prime is 12686521781. The next prime is 12686521811. The reversal of 12686521800 is 812568621.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10571502 + ... + 10572701.

It is an arithmetic number, because the mean of its divisors is an integer number (819337905).

Almost surely, 2^12686521800 is an apocalyptic number.

12686521800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12686521800 is an abundant number, since it is smaller than the sum of its proper divisors (26641697640).

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

12686521800 is a wasteful number, since it uses less digits than its factorization.

12686521800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21144222 (or 21144213 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The spelling of 12686521800 in words is "twelve billion, six hundred eighty-six million, five hundred twenty-one thousand, eight hundred".