644424253297 has 8 divisors (see below), whose sum is σ = 740008712160. Its totient is φ = 555006533760.

The previous prime is 644424253267. The next prime is 644424253301. The reversal of 644424253297 is 792352424446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 644424253297 - 2²³ = 644415864689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644424253267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1541684608 + ... + 1541685025.

It is an arithmetic number, because the mean of its divisors is an integer number (92501089020).

Almost surely, 2^644424253297 is an apocalyptic number.

It is an amenable number.

644424253297 is a deficient number, since it is larger than the sum of its proper divisors (95584458863).

644424253297 is a wasteful number, since it uses less digits than its factorization.

644424253297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3083369663.

The product of its digits is 11612160, while the sum is 52.

The spelling of 644424253297 in words is "six hundred forty-four billion, four hundred twenty-four million, two hundred fifty-three thousand, two hundred ninety-seven".