18559641980 has 24 divisors (see below), whose sum is σ = 42518453040. Its totient is φ = 6748960640.

The previous prime is 18559641979. The next prime is 18559642007. The reversal of 18559641980 is 8914695581.

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, 42180785 + ... + 42181224.

It is an arithmetic number, because the mean of its divisors is an integer number (1771602210).

Almost surely, 2^18559641980 is an apocalyptic number.

18559641980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18559641980 is an abundant number, since it is smaller than the sum of its proper divisors (23958811060).

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

18559641980 is a wasteful number, since it uses less digits than its factorization.

18559641980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84362029 (or 84362027 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 56.

The spelling of 18559641980 in words is "eighteen billion, five hundred fifty-nine million, six hundred forty-one thousand, nine hundred eighty".