18997840580 has 24 divisors (see below), whose sum is σ = 39899654592. Its totient is φ = 7598338272.

The previous prime is 18997840573. The next prime is 18997840613. The reversal of 18997840580 is 8504879981.

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, 168719 + ... + 257801.

It is an arithmetic number, because the mean of its divisors is an integer number (1662485608).

Almost surely, 2^18997840580 is an apocalyptic number.

18997840580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18997840580 is an abundant number, since it is smaller than the sum of its proper divisors (20901814012).

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

18997840580 is a wasteful number, since it uses less digits than its factorization.

18997840580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99755 (or 99753 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 59.

The spelling of 18997840580 in words is "eighteen billion, nine hundred ninety-seven million, eight hundred forty thousand, five hundred eighty".