18655785880 has 32 divisors (see below), whose sum is σ = 42767514000. Its totient is φ = 7321515136.

The previous prime is 18655785871. The next prime is 18655785887. The reversal of 18655785880 is 8858755681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18655785887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4397830 + ... + 4402069.

Almost surely, 2^18655785880 is an apocalyptic number.

18655785880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18655785880 is an abundant number, since it is smaller than the sum of its proper divisors (24111728120).

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

18655785880 is a wasteful number, since it uses less digits than its factorization.

18655785880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8799963 (or 8799959 counting only the distinct ones).

The product of its (nonzero) digits is 21504000, while the sum is 61.

The spelling of 18655785880 in words is "eighteen billion, six hundred fifty-five million, seven hundred eighty-five thousand, eight hundred eighty".