644374942204 has 12 divisors (see below), whose sum is σ = 1288749884464. Its totient is φ = 276160689504.

The previous prime is 644374942199. The next prime is 644374942213. The reversal of 644374942204 is 402249473446.

It is a happy number.

644374942204 is an admirable number.

It is a super-2 number, since 2×644374942204² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11506695369 + ... + 11506695424.

Almost surely, 2^644374942204 is an apocalyptic number.

It is an amenable number.

644374942204 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

644374942204 is a wasteful number, since it uses less digits than its factorization.

644374942204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23013390804 (or 23013390802 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 49.

The spelling of 644374942204 in words is "six hundred forty-four billion, three hundred seventy-four million, nine hundred forty-two thousand, two hundred four".