18725564144 has 80 divisors (see below), whose sum is σ = 42271842048. Its totient is φ = 7869920256.

The previous prime is 18725564089. The next prime is 18725564153. The reversal of 18725564144 is 44146552781.

It is a super-2 number, since 2×18725564144² (a number of 21 digits) contains 22 as substring.

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, 1697912 + ... + 1708904.

Almost surely, 2^18725564144 is an apocalyptic number.

18725564144 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18725564144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21135921024).

18725564144 is an abundant number, since it is smaller than the sum of its proper divisors (23546277904).

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

18725564144 is a wasteful number, since it uses less digits than its factorization.

18725564144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11302 (or 11296 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 47.

The spelling of 18725564144 in words is "eighteen billion, seven hundred twenty-five million, five hundred sixty-four thousand, one hundred forty-four".