644719161472 has 32 divisors (see below), whose sum is σ = 1291126118400. Its totient is φ = 320671822080.

The previous prime is 644719161433. The next prime is 644719161529. The reversal of 644719161472 is 274161917446.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13161072 + ... + 13209967.

It is an arithmetic number, because the mean of its divisors is an integer number (40347691200).

Almost surely, 2^644719161472 is an apocalyptic number.

It is an amenable number.

644719161472 is an abundant number, since it is smaller than the sum of its proper divisors (646406956928).

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

644719161472 is a wasteful number, since it uses less digits than its factorization.

644719161472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26371244 (or 26371232 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 52.

The spelling of 644719161472 in words is "six hundred forty-four billion, seven hundred nineteen million, one hundred sixty-one thousand, four hundred seventy-two".