644512031152299 has 72 divisors (see below), whose sum is σ = 1033993264973760. Its totient is φ = 385723056714336.

The previous prime is 644512031152181. The next prime is 644512031152349. The reversal of 644512031152299 is 992251130215446.

644512031152299 is a `hidden beast` number, since 6 + 4 + 4 + 5 + 1 + 20 + 3 + 1 + 1 + 522 + 99 = 666.

It is not a de Polignac number, because 644512031152299 - 2¹² = 644512031148203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (644512031152399) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 23614849 + ... + 42973074.

It is an arithmetic number, because the mean of its divisors is an integer number (14361017569080).

Almost surely, 2^{644512031152299} is an apocalyptic number.

644512031152299 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

644512031152299 is a deficient number, since it is larger than the sum of its proper divisors (389481233821461).

644512031152299 is a wasteful number, since it uses less digits than its factorization.

644512031152299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66588101 (or 66588075 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 644512031152299 in words is "six hundred forty-four trillion, five hundred twelve billion, thirty-one million, one hundred fifty-two thousand, two hundred ninety-nine".