644974583479 has 2 divisors, whose sum is σ = 644974583480. Its totient is φ = 644974583478.

The previous prime is 644974583453. The next prime is 644974583489. The reversal of 644974583479 is 974385479446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 644974583479 - 2¹⁵ = 644974550711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644974583489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322487291739 + 322487291740.

It is an arithmetic number, because the mean of its divisors is an integer number (322487291740).

Almost surely, 2^644974583479 is an apocalyptic number.

644974583479 is a deficient number, since it is larger than the sum of its proper divisors (1).

644974583479 is an equidigital number, since it uses as much as digits as its factorization.

644974583479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 731566080, while the sum is 70.

The spelling of 644974583479 in words is "six hundred forty-four billion, nine hundred seventy-four million, five hundred eighty-three thousand, four hundred seventy-nine".