18319520491992 has 48 divisors (see below), whose sum is σ = 49618964185440. Its totient is φ = 6106064223168.

The previous prime is 18319520491907. The next prime is 18319520492027. The reversal of 18319520491992 is 29919402591381.

18319520491992 is a `hidden beast` number, since 1 + 8 + 3 + 1 + 9 + 52 + 0 + 491 + 9 + 92 = 666.

It is a super-2 number, since 2×18319520491992² (a number of 27 digits) contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 8219983 + ... + 10208190.

It is an arithmetic number, because the mean of its divisors is an integer number (1033728420530).

Almost surely, 2^{18319520491992} is an apocalyptic number.

18319520491992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18319520491992 is an abundant number, since it is smaller than the sum of its proper divisors (31299443693448).

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

18319520491992 is a wasteful number, since it uses less digits than its factorization.

18319520491992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18441992 (or 18441985 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 63.

The spelling of 18319520491992 in words is "eighteen trillion, three hundred nineteen billion, five hundred twenty million, four hundred ninety-one thousand, nine hundred ninety-two".