18900370068520 has 32 divisors (see below), whose sum is σ = 42646302466920. Its totient is φ = 7538731171840.

The previous prime is 18900370068511. The next prime is 18900370068551. The reversal of 18900370068520 is 2586007300981.

It can be written as a sum of positive squares in 4 ways, for example, as 14957262321444 + 3943107747076 = 3867462^2 + 1985726^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 669262441 + ... + 669290680.

Almost surely, 2^{18900370068520} is an apocalyptic number.

18900370068520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18900370068520 is an abundant number, since it is smaller than the sum of its proper divisors (23745932398400).

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

18900370068520 is a wasteful number, since it uses less digits than its factorization.

18900370068520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338553485 (or 1338553481 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 18900370068520 in words is "eighteen trillion, nine hundred billion, three hundred seventy million, sixty-eight thousand, five hundred twenty".