668922757 has 4 divisors (see below), whose sum is σ = 669050496. Its totient is φ = 668795020.

The previous prime is 668922719. The next prime is 668922763. The reversal of 668922757 is 757229866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668922757 is a prime.

It is a super-3 number, since 3×668922757³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668922857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55663 + ... + 66604.

It is an arithmetic number, because the mean of its divisors is an integer number (167262624).

Almost surely, 2^668922757 is an apocalyptic number.

It is an amenable number.

668922757 is a deficient number, since it is larger than the sum of its proper divisors (127739).

668922757 is a wasteful number, since it uses less digits than its factorization.

668922757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127738.

The product of its digits is 2540160, while the sum is 52.

The square root of 668922757 is about 25863.5410761945. The cubic root of 668922757 is about 874.5647934236.

The spelling of 668922757 in words is "six hundred sixty-eight million, nine hundred twenty-two thousand, seven hundred fifty-seven".