644710170438479 has 16 divisors (see below), whose sum is σ = 678572775552000. Its totient is φ = 611719962960960.

The previous prime is 644710170438469. The next prime is 644710170438487. The reversal of 644710170438479 is 974834071017446.

It is a de Polignac number, because none of the positive numbers 2^k-644710170438479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644710170438469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 464337494 + ... + 465723875.

It is an arithmetic number, because the mean of its divisors is an integer number (42410798472000).

Almost surely, 2^{644710170438479} is an apocalyptic number.

644710170438479 is a deficient number, since it is larger than the sum of its proper divisors (33862605113521).

644710170438479 is a wasteful number, since it uses less digits than its factorization.

644710170438479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930061838.

The product of its (nonzero) digits is 113799168, while the sum is 65.

The spelling of 644710170438479 in words is "six hundred forty-four trillion, seven hundred ten billion, one hundred seventy million, four hundred thirty-eight thousand, four hundred seventy-nine".