64915860731 has 8 divisors (see below), whose sum is σ = 72352043280. Its totient is φ = 57881634048.

The previous prime is 64915860719. The next prime is 64915860749. The reversal of 64915860731 is 13706851946.

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

It is not a de Polignac number, because 64915860731 - 2²² = 64911666427 is a prime.

It is a super-2 number, since 2×64915860731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64915860731.

It is not an unprimeable number, because it can be changed into a prime (64915860781) 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, 100488626 + ... + 100489271.

It is an arithmetic number, because the mean of its divisors is an integer number (9044005410).

Almost surely, 2^64915860731 is an apocalyptic number.

64915860731 is a deficient number, since it is larger than the sum of its proper divisors (7436182549).

64915860731 is a wasteful number, since it uses less digits than its factorization.

64915860731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200977933.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 64915860731 in words is "sixty-four billion, nine hundred fifteen million, eight hundred sixty thousand, seven hundred thirty-one".