38891618856 has 64 divisors (see below), whose sum is σ = 108222480000. Its totient is φ = 12941048448.

The previous prime is 38891618839. The next prime is 38891618861. The reversal of 38891618856 is 65881619883.

38891618856 is a `hidden beast` number, since 3 + 8 + 8 + 9 + 1 + 618 + 8 + 5 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 38891618793 and 38891618802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35316 + ... + 281123.

It is an arithmetic number, because the mean of its divisors is an integer number (1690976250).

Almost surely, 2^38891618856 is an apocalyptic number.

38891618856 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38891618856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54111240000).

38891618856 is an abundant number, since it is smaller than the sum of its proper divisors (69330861144).

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

38891618856 is a wasteful number, since it uses less digits than its factorization.

38891618856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317023 (or 317013 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 63.

The spelling of 38891618856 in words is "thirty-eight billion, eight hundred ninety-one million, six hundred eighteen thousand, eight hundred fifty-six".