18921807578062 has 32 divisors (see below), whose sum is σ = 29034201893760. Its totient is φ = 9245775708000.

The previous prime is 18921807578029. The next prime is 18921807578203. The reversal of 18921807578062 is 26087570812981.

It is a junction number, because it is equal to n+sod(n) for n = 18921807577985 and 18921807578003.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14879448 + ... + 16100980.

It is an arithmetic number, because the mean of its divisors is an integer number (907318809180).

Almost surely, 2^{18921807578062} is an apocalyptic number.

18921807578062 is a deficient number, since it is larger than the sum of its proper divisors (10112394315698).

18921807578062 is a wasteful number, since it uses less digits than its factorization.

18921807578062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222368.

The product of its (nonzero) digits is 27095040, while the sum is 64.

The spelling of 18921807578062 in words is "eighteen trillion, nine hundred twenty-one billion, eight hundred seven million, five hundred seventy-eight thousand, sixty-two".