18806864402640 has 160 divisors (see below), whose sum is σ = 62675508510720. Its totient is φ = 4650118267392.

The previous prime is 18806864402633. The next prime is 18806864402663. The reversal of 18806864402640 is 4620446860881.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 43661344 + ... + 44089983.

It is an arithmetic number, because the mean of its divisors is an integer number (391721928192).

Almost surely, 2^{18806864402640} is an apocalyptic number.

18806864402640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18806864402640 is an abundant number, since it is smaller than the sum of its proper divisors (43868644108080).

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

18806864402640 is a wasteful number, since it uses less digits than its factorization.

18806864402640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87751409 (or 87751403 counting only the distinct ones).

The product of its (nonzero) digits is 14155776, while the sum is 57.

The spelling of 18806864402640 in words is "eighteen trillion, eight hundred six billion, eight hundred sixty-four million, four hundred two thousand, six hundred forty".