18780660864 has 128 divisors (see below), whose sum is σ = 63347548800. Its totient is φ = 5365896192.

The previous prime is 18780660841. The next prime is 18780660881. The reversal of 18780660864 is 46806608781.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 18780660864.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 363967 + ... + 412350.

It is an arithmetic number, because the mean of its divisors is an integer number (494902725).

Almost surely, 2^18780660864 is an apocalyptic number.

18780660864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18780660864 is an abundant number, since it is smaller than the sum of its proper divisors (44566887936).

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

18780660864 is an equidigital number, since it uses as much as digits as its factorization.

18780660864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776347 (or 776329 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 18780660864 in words is "eighteen billion, seven hundred eighty million, six hundred sixty thousand, eight hundred sixty-four".