644974550711 has 2 divisors, whose sum is σ = 644974550712. Its totient is φ = 644974550710.

The previous prime is 644974550699. The next prime is 644974550713. The reversal of 644974550711 is 117055479446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 644974550711 - 2²⁶ = 644907441847 is a prime.

Together with 644974550713, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644974550713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322487275355 + 322487275356.

It is an arithmetic number, because the mean of its divisors is an integer number (322487275356).

Almost surely, 2^644974550711 is an apocalyptic number.

644974550711 is a deficient number, since it is larger than the sum of its proper divisors (1).

644974550711 is an equidigital number, since it uses as much as digits as its factorization.

644974550711 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4233600, while the sum is 53.

The spelling of 644974550711 in words is "six hundred forty-four billion, nine hundred seventy-four million, five hundred fifty thousand, seven hundred eleven".