644374942254 has 32 divisors (see below), whose sum is σ = 1445326986240. Its totient is φ = 212784246936.

The previous prime is 644374942249. The next prime is 644374942271. The reversal of 644374942254 is 452249473446.

644374942254 is a `hidden beast` number, since 6 + 44 + 374 + 9 + 4 + 225 + 4 = 666.

644374942254 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 644374942254.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55755294 + ... + 55766849.

It is an arithmetic number, because the mean of its divisors is an integer number (45166468320).

Almost surely, 2^644374942254 is an apocalyptic number.

644374942254 is an abundant number, since it is smaller than the sum of its proper divisors (800952043986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644374942254 is a wasteful number, since it uses less digits than its factorization.

644374942254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111522261 (or 111522255 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 54.

The spelling of 644374942254 in words is "six hundred forty-four billion, three hundred seventy-four million, nine hundred forty-two thousand, two hundred fifty-four".