644527002255 has 24 divisors (see below), whose sum is σ = 1051067812368. Its totient is φ = 337261906176.

The previous prime is 644527002239. The next prime is 644527002263. The reversal of 644527002255 is 552200725446.

It is not a de Polignac number, because 644527002255 - 2⁴ = 644527002239 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7606222 + ... + 7690491.

It is an arithmetic number, because the mean of its divisors is an integer number (43794492182).

Almost surely, 2^644527002255 is an apocalyptic number.

644527002255 is a deficient number, since it is larger than the sum of its proper divisors (406540810113).

644527002255 is a wasteful number, since it uses less digits than its factorization.

644527002255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15296827 (or 15296774 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 42.

The spelling of 644527002255 in words is "six hundred forty-four billion, five hundred twenty-seven million, two thousand, two hundred fifty-five".