644576451306 has 16 divisors (see below), whose sum is σ = 1298993766048. Its totient is φ = 213218673200.

The previous prime is 644576451269. The next prime is 644576451313. The reversal of 644576451306 is 603154675446.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410035125 + ... + 410036696.

It is an arithmetic number, because the mean of its divisors is an integer number (81187110378).

Almost surely, 2^644576451306 is an apocalyptic number.

644576451306 is an abundant number, since it is smaller than the sum of its proper divisors (654417314742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644576451306 is a wasteful number, since it uses less digits than its factorization.

644576451306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820071957.

The product of its (nonzero) digits is 7257600, while the sum is 51.

The spelling of 644576451306 in words is "six hundred forty-four billion, five hundred seventy-six million, four hundred fifty-one thousand, three hundred six".