671914647616 has 63 divisors (see below), whose sum is σ = 1351463863869. Its totient is φ = 331448951808.

The previous prime is 671914647589. The next prime is 671914647641. The reversal of 671914647616 is 616746419176.

The square root of 671914647616 is 819704.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 669844033600 + 2070614016 = 818440^2 + 45504^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 518052280 + ... + 518053576.

It is an arithmetic number, because the mean of its divisors is an integer number (21451807363).

Almost surely, 2^671914647616 is an apocalyptic number.

671914647616 is the 819704-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671914647616

671914647616 is an abundant number, since it is smaller than the sum of its proper divisors (679549216253).

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

671914647616 is an frugal number, since it uses more digits than its factorization.

671914647616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2764 (or 1378 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 58.

The spelling of 671914647616 in words is "six hundred seventy-one billion, nine hundred fourteen million, six hundred forty-seven thousand, six hundred sixteen".