644374942296 has 32 divisors (see below), whose sum is σ = 1611921533040. Its totient is φ = 214660423808.

The previous prime is 644374942279. The next prime is 644374942301. The reversal of 644374942296 is 692249473446.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8161371 + ... + 8239946.

Almost surely, 2^644374942296 is an apocalyptic number.

It is an amenable number.

644374942296 is an abundant number, since it is smaller than the sum of its proper divisors (967546590744).

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

644374942296 is a wasteful number, since it uses less digits than its factorization.

644374942296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16402963 (or 16402959 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 60.

The spelling of 644374942296 in words is "six hundred forty-four billion, three hundred seventy-four million, nine hundred forty-two thousand, two hundred ninety-six".