18956664789600 has 144 divisors (see below), whose sum is σ = 65333587789008. Its totient is φ = 4757751152640.

The previous prime is 18956664789581. The next prime is 18956664789691. The reversal of 18956664789600 is 698746665981.

It is a Harshad number since it is a multiple of its sum of digits (75).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 232271269 + ... + 232352868.

It is an arithmetic number, because the mean of its divisors is an integer number (453705470757).

Almost surely, 2^{18956664789600} is an apocalyptic number.

18956664789600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18956664789600 is an abundant number, since it is smaller than the sum of its proper divisors (46376922999408).

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

18956664789600 is a wasteful number, since it uses less digits than its factorization.

18956664789600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464624177 (or 464624164 counting only the distinct ones).

The product of its (nonzero) digits is 940584960, while the sum is 75.

The spelling of 18956664789600 in words is "eighteen trillion, nine hundred fifty-six billion, six hundred sixty-four million, seven hundred eighty-nine thousand, six hundred".