18625599980 has 48 divisors (see below), whose sum is σ = 42133633920. Its totient is φ = 6875328768.

The previous prime is 18625599947. The next prime is 18625599989. The reversal of 18625599980 is 8999552681.

It is a super-2 number, since 2×18625599980² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18625599989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1354781 + ... + 1368459.

It is an arithmetic number, because the mean of its divisors is an integer number (877784040).

Almost surely, 2^18625599980 is an apocalyptic number.

18625599980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18625599980 is an abundant number, since it is smaller than the sum of its proper divisors (23508033940).

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

18625599980 is a wasteful number, since it uses less digits than its factorization.

18625599980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18938 (or 18936 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 62.

The spelling of 18625599980 in words is "eighteen billion, six hundred twenty-five million, five hundred ninety-nine thousand, nine hundred eighty".