38018181981816 has 96 divisors (see below), whose sum is σ = 107444324482560. Its totient is φ = 12121554578496.

The previous prime is 38018181981799. The next prime is 38018181981821. The reversal of 38018181981816 is 61818918181083.

38018181981816 is a `hidden beast` number, since 380 + 1 + 81 + 81 + 98 + 1 + 8 + 16 = 666.

38018181981816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×38018181981816² (a number of 28 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 (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144972685 + ... + 145234691.

It is an arithmetic number, because the mean of its divisors is an integer number (1119211713360).

Almost surely, 2^{38018181981816} is an apocalyptic number.

38018181981816 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

38018181981816 is an abundant number, since it is smaller than the sum of its proper divisors (69426142500744).

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

38018181981816 is a wasteful number, since it uses less digits than its factorization.

38018181981816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349665 (or 349658 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 63.

The spelling of 38018181981816 in words is "thirty-eight trillion, eighteen billion, one hundred eighty-one million, nine hundred eighty-one thousand, eight hundred sixteen".