668197707 has 4 divisors (see below), whose sum is σ = 890930280. Its totient is φ = 445465136.

The previous prime is 668197697. The next prime is 668197709. The reversal of 668197707 is 707791866.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 668197707 - 2⁸ = 668197451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668197707.

It is not an unprimeable number, because it can be changed into a prime (668197709) 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, 111366282 + ... + 111366287.

It is an arithmetic number, because the mean of its divisors is an integer number (222732570).

Almost surely, 2^668197707 is an apocalyptic number.

668197707 is a deficient number, since it is larger than the sum of its proper divisors (222732573).

668197707 is a wasteful number, since it uses less digits than its factorization.

668197707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222732572.

The product of its (nonzero) digits is 889056, while the sum is 51.

The square root of 668197707 is about 25849.5204404260. The cubic root of 668197707 is about 874.2486969148.

The spelling of 668197707 in words is "six hundred sixty-eight million, one hundred ninety-seven thousand, seven hundred seven".