18368546005638 has 96 divisors (see below), whose sum is σ = 42211392178176. Its totient is φ = 5752871771904.

The previous prime is 18368546005631. The next prime is 18368546005709. The reversal of 18368546005638 is 83650064586381.

18368546005638 is a `hidden beast` number, since 1 + 8 + 3 + 6 + 8 + 5 + 4 + 60 + 0 + 563 + 8 = 666.

It is a super-2 number, since 2×18368546005638² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18368546005631) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 494783745 + ... + 494820867.

It is an arithmetic number, because the mean of its divisors is an integer number (439702001856).

Almost surely, 2^{18368546005638} is an apocalyptic number.

18368546005638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18368546005638 is an abundant number, since it is smaller than the sum of its proper divisors (23842846172538).

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

18368546005638 is a wasteful number, since it uses less digits than its factorization.

18368546005638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39858 (or 39855 counting only the distinct ones).

The product of its (nonzero) digits is 99532800, while the sum is 63.

The spelling of 18368546005638 in words is "eighteen trillion, three hundred sixty-eight billion, five hundred forty-six million, five thousand, six hundred thirty-eight".