18625135440 has 80 divisors (see below), whose sum is σ = 57762517248. Its totient is φ = 4964587008.

The previous prime is 18625135433. The next prime is 18625135457. The reversal of 18625135440 is 4453152681.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 595062 + ... + 625578.

Almost surely, 2^18625135440 is an apocalyptic number.

18625135440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18625135440 is an abundant number, since it is smaller than the sum of its proper divisors (39137381808).

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

18625135440 is a wasteful number, since it uses less digits than its factorization.

18625135440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33076 (or 33070 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The spelling of 18625135440 in words is "eighteen billion, six hundred twenty-five million, one hundred thirty-five thousand, four hundred forty".