12561364450 has 12 divisors (see below), whose sum is σ = 23364137970. Its totient is φ = 5024545760.

The previous prime is 12561364441. The next prime is 12561364483. The reversal of 12561364450 is 5446316521.

It can be written as a sum of positive squares in 3 ways, for example, as 7823933209 + 4737431241 = 88453^2 + 68829^2 .

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, 125613595 + ... + 125613694.

Almost surely, 2^12561364450 is an apocalyptic number.

12561364450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12561364450 is a deficient number, since it is larger than the sum of its proper divisors (10802773520).

12561364450 is a wasteful number, since it uses less digits than its factorization.

12561364450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251227301 (or 251227296 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 12561364450 in words is "twelve billion, five hundred sixty-one million, three hundred sixty-four thousand, four hundred fifty".