644576451308 has 24 divisors (see below), whose sum is σ = 1149495166512. Its totient is φ = 316151411264.

The previous prime is 644576451269. The next prime is 644576451313. The reversal of 644576451308 is 803154675446.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a self number, because there is not a number n which added to its sum of digits gives 644576451308.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 946091 + ... + 1477917.

It is an arithmetic number, because the mean of its divisors is an integer number (47895631938).

Almost surely, 2^644576451308 is an apocalyptic number.

It is an amenable number.

644576451308 is a deficient number, since it is larger than the sum of its proper divisors (504918715204).

644576451308 is a wasteful number, since it uses less digits than its factorization.

644576451308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537601 (or 537599 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 53.

The spelling of 644576451308 in words is "six hundred forty-four billion, five hundred seventy-six million, four hundred fifty-one thousand, three hundred eight".