716721671 has 4 divisors (see below), whose sum is σ = 717313752. Its totient is φ = 716129592.

The previous prime is 716721661. The next prime is 716721701. The reversal of 716721671 is 176127617.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-716721671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (716721611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294221 + ... + 296646.

It is an arithmetic number, because the mean of its divisors is an integer number (179328438).

Almost surely, 2^716721671 is an apocalyptic number.

716721671 is a deficient number, since it is larger than the sum of its proper divisors (592081).

716721671 is a wasteful number, since it uses less digits than its factorization.

716721671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592080.

The product of its digits is 24696, while the sum is 38.

The square root of 716721671 is about 26771.6579800355. The cubic root of 716721671 is about 894.9185535988.

The spelling of 716721671 in words is "seven hundred sixteen million, seven hundred twenty-one thousand, six hundred seventy-one".