644851152412 has 48 divisors (see below), whose sum is σ = 1138248367200. Its totient is φ = 319653734400.

The previous prime is 644851152377. The next prime is 644851152431. The reversal of 644851152412 is 214251158446.

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 15 ways as a sum of consecutive naturals, for example, 190276014 + ... + 190279402.

It is an arithmetic number, because the mean of its divisors is an integer number (23713507650).

Almost surely, 2^644851152412 is an apocalyptic number.

It is an amenable number.

644851152412 is a deficient number, since it is larger than the sum of its proper divisors (493397214788).

644851152412 is a wasteful number, since it uses less digits than its factorization.

644851152412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4486 (or 4484 counting only the distinct ones).

The product of its digits is 307200, while the sum is 43.

The spelling of 644851152412 in words is "six hundred forty-four billion, eight hundred fifty-one million, one hundred fifty-two thousand, four hundred twelve".