64779517313 has 4 divisors (see below), whose sum is σ = 74033734080. Its totient is φ = 55525300548.

The previous prime is 64779517303. The next prime is 64779517337. The reversal of 64779517313 is 31371597746.

64779517313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64779517313 - 2⁶ = 64779517249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64779517303) 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, 4627108373 + ... + 4627108386.

It is an arithmetic number, because the mean of its divisors is an integer number (18508433520).

Almost surely, 2^64779517313 is an apocalyptic number.

It is an amenable number.

64779517313 is a deficient number, since it is larger than the sum of its proper divisors (9254216767).

64779517313 is an equidigital number, since it uses as much as digits as its factorization.

64779517313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9254216766.

The product of its digits is 3333960, while the sum is 53.

The spelling of 64779517313 in words is "sixty-four billion, seven hundred seventy-nine million, five hundred seventeen thousand, three hundred thirteen".