18513816980 has 24 divisors (see below), whose sum is σ = 40925280480. Its totient is φ = 7015762080.

The previous prime is 18513816973. The next prime is 18513817001. The reversal of 18513816980 is 8961831581.

It is a super-2 number, since 2×18513816980² (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 7 ways as a sum of consecutive naturals, for example, 24359906 + ... + 24360665.

It is an arithmetic number, because the mean of its divisors is an integer number (1705220020).

Almost surely, 2^18513816980 is an apocalyptic number.

18513816980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18513816980 is an abundant number, since it is smaller than the sum of its proper divisors (22411463500).

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

18513816980 is a wasteful number, since it uses less digits than its factorization.

18513816980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48720599 (or 48720597 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 50.

The spelling of 18513816980 in words is "eighteen billion, five hundred thirteen million, eight hundred sixteen thousand, nine hundred eighty".