64756961279 has 4 divisors (see below), whose sum is σ = 64768410120. Its totient is φ = 64745512440.

The previous prime is 64756961263. The next prime is 64756961281. The reversal of 64756961279 is 97216965746.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64756961279 - 2⁴ = 64756961263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64756961779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5715932 + ... + 5727249.

It is an arithmetic number, because the mean of its divisors is an integer number (16192102530).

Almost surely, 2^64756961279 is an apocalyptic number.

64756961279 is a deficient number, since it is larger than the sum of its proper divisors (11448841).

64756961279 is a wasteful number, since it uses less digits than its factorization.

64756961279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11448840.

The product of its digits is 34292160, while the sum is 62.

The spelling of 64756961279 in words is "sixty-four billion, seven hundred fifty-six million, nine hundred sixty-one thousand, two hundred seventy-nine".