644512035120325 has 24 divisors (see below), whose sum is σ = 800161974048200. Its totient is φ = 514985806540800.

The previous prime is 644512035120311. The next prime is 644512035120403. The reversal of 644512035120325 is 523021530215446.

It can be written as a sum of positive squares in 12 ways, for example, as 12006938800609 + 632505096319716 = 3465103^2 + 25149654^2 .

It is not a de Polignac number, because 644512035120325 - 2¹³ = 644512035112133 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, 315777085 + ... + 317811565.

Almost surely, 2^{644512035120325} is an apocalyptic number.

It is an amenable number.

644512035120325 is a deficient number, since it is larger than the sum of its proper divisors (155649938927875).

644512035120325 is a wasteful number, since it uses less digits than its factorization.

644512035120325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2049817 (or 2049812 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 644512035120325 in words is "six hundred forty-four trillion, five hundred twelve billion, thirty-five million, one hundred twenty thousand, three hundred twenty-five".