644089134188 has 12 divisors (see below), whose sum is σ = 1135760229912. Its totient is φ = 319586211360.

The previous prime is 644089134179. The next prime is 644089134217. The reversal of 644089134188 is 881431980446.

It is a happy 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, 614588345 + ... + 614589392.

It is an arithmetic number, because the mean of its divisors is an integer number (94646685826).

Almost surely, 2^644089134188 is an apocalyptic number.

It is an amenable number.

644089134188 is a deficient number, since it is larger than the sum of its proper divisors (491671095724).

644089134188 is a wasteful number, since it uses less digits than its factorization.

644089134188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229177872 (or 1229177870 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 56.

The spelling of 644089134188 in words is "six hundred forty-four billion, eighty-nine million, one hundred thirty-four thousand, one hundred eighty-eight".