644311331363352 has 128 divisors (see below), whose sum is σ = 1689265399449600. Its totient is φ = 204550495948800.

The previous prime is 644311331363347. The next prime is 644311331363411. The reversal of 644311331363352 is 253363133113446.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12020299 + ... + 37856442.

It is an arithmetic number, because the mean of its divisors is an integer number (13197385933200).

Almost surely, 2^{644311331363352} is an apocalyptic number.

644311331363352 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

644311331363352 is an abundant number, since it is smaller than the sum of its proper divisors (1044954068086248).

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

644311331363352 is a wasteful number, since it uses less digits than its factorization.

644311331363352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49877057 (or 49877053 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 48.

Adding to 644311331363352 its reverse (253363133113446), we get a palindrome (897674464476798).

The spelling of 644311331363352 in words is "six hundred forty-four trillion, three hundred eleven billion, three hundred thirty-one million, three hundred sixty-three thousand, three hundred fifty-two".