64864515975 has 48 divisors (see below), whose sum is σ = 123198281472. Its totient is φ = 29498664960.

The previous prime is 64864515941. The next prime is 64864515979. The reversal of 64864515975 is 57951546846.

It is not a de Polignac number, because 64864515975 - 2¹⁴ = 64864499591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64864515979) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 218757 + ... + 421406.

It is an arithmetic number, because the mean of its divisors is an integer number (2566630864).

Almost surely, 2^64864515975 is an apocalyptic number.

64864515975 is a deficient number, since it is larger than the sum of its proper divisors (58333765497).

64864515975 is a wasteful number, since it uses less digits than its factorization.

64864515975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640376 (or 640371 counting only the distinct ones).

The product of its digits is 36288000, while the sum is 60.

The spelling of 64864515975 in words is "sixty-four billion, eight hundred sixty-four million, five hundred fifteen thousand, nine hundred seventy-five".