38538181868538 has 32 divisors (see below), whose sum is σ = 88508743050240. Its totient is φ = 11063592880560.

The previous prime is 38538181868429. The next prime is 38538181868539. The reversal of 38538181868538 is 83586818183583.

It is a super-2 number, since 2×38538181868538² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 38538181868538.

It is not an unprimeable number, because it can be changed into a prime (38538181868539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15366099970 + ... + 15366102477.

It is an arithmetic number, because the mean of its divisors is an integer number (2765898220320).

Almost surely, 2^{38538181868538} is an apocalyptic number.

38538181868538 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

38538181868538 is an abundant number, since it is smaller than the sum of its proper divisors (49970561181702).

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

38538181868538 is a wasteful number, since it uses less digits than its factorization.

38538181868538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30732202482.

The product of its digits is 1061683200, while the sum is 75.

The spelling of 38538181868538 in words is "thirty-eight trillion, five hundred thirty-eight billion, one hundred eighty-one million, eight hundred sixty-eight thousand, five hundred thirty-eight".