12511520400 has 120 divisors (see below), whose sum is σ = 41161921024. Its totient is φ = 3246220800.

The previous prime is 12511520389. The next prime is 12511520407. The reversal of 12511520400 is 402511521.

It is a tau number, because it is divible by the number of its divisors (120).

It is not an unprimeable number, because it can be changed into a prime (12511520407) 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, 96496 + ... + 185295.

Almost surely, 2^12511520400 is an apocalyptic number.

12511520400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12511520400 is an abundant number, since it is smaller than the sum of its proper divisors (28650400624).

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

12511520400 is a wasteful number, since it uses less digits than its factorization.

12511520400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281849 (or 281838 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The spelling of 12511520400 in words is "twelve billion, five hundred eleven million, five hundred twenty thousand, four hundred".