644374942305 has 32 divisors (see below), whose sum is σ = 1035584452224. Its totient is φ = 342140875776.

The previous prime is 644374942301. The next prime is 644374942339. The reversal of 644374942305 is 503249473446.

It is not a de Polignac number, because 644374942305 - 2² = 644374942301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (644374942301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4218882 + ... + 4368948.

It is an arithmetic number, because the mean of its divisors is an integer number (32362014132).

Almost surely, 2^644374942305 is an apocalyptic number.

It is an amenable number.

644374942305 is a deficient number, since it is larger than the sum of its proper divisors (391209509919).

644374942305 is a wasteful number, since it uses less digits than its factorization.

644374942305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151345.

The product of its (nonzero) digits is 8709120, while the sum is 51.

The spelling of 644374942305 in words is "six hundred forty-four billion, three hundred seventy-four million, nine hundred forty-two thousand, three hundred five".