664165632679 has 4 divisors (see below), whose sum is σ = 664821275976. Its totient is φ = 663509989384.

The previous prime is 664165632661. The next prime is 664165632719. The reversal of 664165632679 is 976236561466.

It is a happy number.

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 664165632679 - 2³⁹ = 114409818791 is a prime.

It is a super-2 number, since 2×664165632679² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664165630679) 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, 327820129 + ... + 327822154.

It is an arithmetic number, because the mean of its divisors is an integer number (166205318994).

Almost surely, 2^664165632679 is an apocalyptic number.

664165632679 is a deficient number, since it is larger than the sum of its proper divisors (655643297).

664165632679 is a wasteful number, since it uses less digits than its factorization.

664165632679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655643296.

The product of its digits is 58786560, while the sum is 61.

The spelling of 664165632679 in words is "six hundred sixty-four billion, one hundred sixty-five million, six hundred thirty-two thousand, six hundred seventy-nine".