64392687317 has 4 divisors (see below), whose sum is σ = 73591642656. Its totient is φ = 55193731980.

The previous prime is 64392687299. The next prime is 64392687323. The reversal of 64392687317 is 71378629346.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71378629346 = 2 ⋅35689314673.

It is a cyclic number.

It is not a de Polignac number, because 64392687317 - 2²⁶ = 64325578453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64392687347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4599477659 + ... + 4599477672.

It is an arithmetic number, because the mean of its divisors is an integer number (18397910664).

Almost surely, 2^64392687317 is an apocalyptic number.

It is an amenable number.

64392687317 is a deficient number, since it is larger than the sum of its proper divisors (9198955339).

64392687317 is an equidigital number, since it uses as much as digits as its factorization.

64392687317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9198955338.

The product of its digits is 9144576, while the sum is 56.

The spelling of 64392687317 in words is "sixty-four billion, three hundred ninety-two million, six hundred eighty-seven thousand, three hundred seventeen".