64501642731 has 16 divisors (see below), whose sum is σ = 88825229856. Its totient is φ = 41611804416.

The previous prime is 64501642721. The next prime is 64501642739. The reversal of 64501642731 is 13724610546.

It is a happy number.

It is not a de Polignac number, because 64501642731 - 2²³ = 64493254123 is a prime.

It is a super-2 number, since 2×64501642731² (a number of 22 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 64501642731.

It is not an unprimeable number, because it can be changed into a prime (64501642739) 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, 2766960 + ... + 2790173.

It is an arithmetic number, because the mean of its divisors is an integer number (5551576866).

Almost surely, 2^64501642731 is an apocalyptic number.

64501642731 is a deficient number, since it is larger than the sum of its proper divisors (24323587125).

64501642731 is a wasteful number, since it uses less digits than its factorization.

64501642731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5557262.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 64501642731 in words is "sixty-four billion, five hundred one million, six hundred forty-two thousand, seven hundred thirty-one".