644576451307 has 16 divisors (see below), whose sum is σ = 681114032640. Its totient is φ = 608997729312.

The previous prime is 644576451269. The next prime is 644576451313. The reversal of 644576451307 is 703154675446.

It is not a de Polignac number, because 644576451307 - 2¹⁵ = 644576418539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644576451347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8033128 + ... + 8112970.

It is an arithmetic number, because the mean of its divisors is an integer number (42569627040).

Almost surely, 2^644576451307 is an apocalyptic number.

644576451307 is a deficient number, since it is larger than the sum of its proper divisors (36537581333).

644576451307 is a wasteful number, since it uses less digits than its factorization.

644576451307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85842.

The product of its (nonzero) digits is 8467200, while the sum is 52.

The spelling of 644576451307 in words is "six hundred forty-four billion, five hundred seventy-six million, four hundred fifty-one thousand, three hundred seven".