717491966 has 4 divisors (see below), whose sum is σ = 1076237952. Its totient is φ = 358745982.

The previous prime is 717491939. The next prime is 717491977. The reversal of 717491966 is 669194717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 669194717 = 337 ⋅1985741.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 179372990 + ... + 179372993.

It is an arithmetic number, because the mean of its divisors is an integer number (269059488).

Almost surely, 2^717491966 is an apocalyptic number.

717491966 is a deficient number, since it is larger than the sum of its proper divisors (358745986).

717491966 is a wasteful number, since it uses less digits than its factorization.

717491966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358745985.

The product of its digits is 571536, while the sum is 50.

The square root of 717491966 is about 26786.0405062040. The cubic root of 717491966 is about 895.2390427105.

The spelling of 717491966 in words is "seven hundred seventeen million, four hundred ninety-one thousand, nine hundred sixty-six".