38687166721 has 8 divisors (see below), whose sum is σ = 46136248704. Its totient is φ = 31718670720.

The previous prime is 38687166719. The next prime is 38687166761. The reversal of 38687166721 is 12766178683.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 38687166721 - 2¹ = 38687166719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38687166761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120146320 + ... + 120146641.

It is an arithmetic number, because the mean of its divisors is an integer number (5767031088).

Almost surely, 2^38687166721 is an apocalyptic number.

It is an amenable number.

38687166721 is a deficient number, since it is larger than the sum of its proper divisors (7449081983).

38687166721 is a wasteful number, since it uses less digits than its factorization.

38687166721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240292991.

The product of its digits is 4064256, while the sum is 55.

The spelling of 38687166721 in words is "thirty-eight billion, six hundred eighty-seven million, one hundred sixty-six thousand, seven hundred twenty-one".