644134634353 has 16 divisors (see below), whose sum is σ = 779735718144. Its totient is φ = 519452236800.

The previous prime is 644134634279. The next prime is 644134634371. The reversal of 644134634353 is 353436431446.

It is a de Polignac number, because none of the positive numbers 2^k-644134634353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644134634053) 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, 632925 + ... + 1299562.

It is an arithmetic number, because the mean of its divisors is an integer number (48733482384).

Almost surely, 2^644134634353 is an apocalyptic number.

It is an amenable number.

644134634353 is a deficient number, since it is larger than the sum of its proper divisors (135601083791).

644134634353 is a wasteful number, since it uses less digits than its factorization.

644134634353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1935312.

The product of its digits is 3732480, while the sum is 46.

The spelling of 644134634353 in words is "six hundred forty-four billion, one hundred thirty-four million, six hundred thirty-four thousand, three hundred fifty-three".