644974583486 has 8 divisors (see below), whose sum is σ = 979708228320. Its totient is φ = 318405174048.

The previous prime is 644974583479. The next prime is 644974583489. The reversal of 644974583486 is 684385479446.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644974583489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2041058651 + ... + 2041058966.

It is an arithmetic number, because the mean of its divisors is an integer number (122463528540).

Almost surely, 2^644974583486 is an apocalyptic number.

644974583486 is a deficient number, since it is larger than the sum of its proper divisors (334733644834).

644974583486 is a wasteful number, since it uses less digits than its factorization.

644974583486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4082117698.

The product of its digits is 557383680, while the sum is 68.

The spelling of 644974583486 in words is "six hundred forty-four billion, nine hundred seventy-four million, five hundred eighty-three thousand, four hundred eighty-six".