671737603216 has 45 divisors (see below), whose sum is σ = 1323571340793. Its totient is φ = 330264404160.

The previous prime is 671737603211. The next prime is 671737603231. The reversal of 671737603216 is 612306737176.

The square root of 671737603216 is 819596.

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., 21843657616 + 649893945600 = 147796^2 + 806160^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671737603216.

It is not an unprimeable number, because it can be changed into a prime (671737603211) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 199979745 + ... + 199983103.

Almost surely, 2^671737603216 is an apocalyptic number.

671737603216 is the 819596-th square number.

It is an amenable number.

671737603216 is a deficient number, since it is larger than the sum of its proper divisors (651833737577).

671737603216 is an frugal number, since it uses more digits than its factorization.

671737603216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6848 (or 3422 counting only the distinct ones).

The product of its (nonzero) digits is 1333584, while the sum is 49.

Multiplying 671737603216 by its sum of digits (49), we get a square (32915142557584 = 5737172²).

The spelling of 671737603216 in words is "six hundred seventy-one billion, seven hundred thirty-seven million, six hundred three thousand, two hundred sixteen".