664622462639 has 4 divisors (see below), whose sum is σ = 664718694024. Its totient is φ = 664526231256.

The previous prime is 664622462633. The next prime is 664622462671. The reversal of 664622462639 is 936264226466.

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 664622462639 - 2²⁰ = 664621414063 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 (664622462633) 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, 48105332 + ... + 48119145.

It is an arithmetic number, because the mean of its divisors is an integer number (166179673506).

Almost surely, 2^664622462639 is an apocalyptic number.

664622462639 is a deficient number, since it is larger than the sum of its proper divisors (96231385).

664622462639 is an equidigital number, since it uses as much as digits as its factorization.

664622462639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96231384.

The product of its digits is 26873856, while the sum is 56.

The spelling of 664622462639 in words is "six hundred sixty-four billion, six hundred twenty-two million, four hundred sixty-two thousand, six hundred thirty-nine".