38646558721 has 16 divisors (see below), whose sum is σ = 39484526400. Its totient is φ = 37815133248.

The previous prime is 38646558701. The next prime is 38646558739. The reversal of 38646558721 is 12785564683.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 38646558721 - 2²⁵ = 38613004289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38646558701) 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, 13620915 + ... + 13623751.

It is an arithmetic number, because the mean of its divisors is an integer number (2467782900).

Almost surely, 2^38646558721 is an apocalyptic number.

It is an amenable number.

38646558721 is a deficient number, since it is larger than the sum of its proper divisors (837967679).

38646558721 is a wasteful number, since it uses less digits than its factorization.

38646558721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888.

The product of its digits is 9676800, while the sum is 55.

The spelling of 38646558721 in words is "thirty-eight billion, six hundred forty-six million, five hundred fifty-eight thousand, seven hundred twenty-one".