668722607 has 16 divisors (see below), whose sum is σ = 792963072. Its totient is φ = 551849760.

The previous prime is 668722603. The next prime is 668722633. The reversal of 668722607 is 706227866.

It is not a de Polignac number, because 668722607 - 2² = 668722603 is a prime.

It is a super-2 number, since 2×668722607² = 894379850225752898, which contains 22 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 (668722601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34928 + ... + 50570.

It is an arithmetic number, because the mean of its divisors is an integer number (49560192).

Almost surely, 2^668722607 is an apocalyptic number.

668722607 is a deficient number, since it is larger than the sum of its proper divisors (124240465).

668722607 is a wasteful number, since it uses less digits than its factorization.

668722607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15878.

The product of its (nonzero) digits is 338688, while the sum is 44.

The square root of 668722607 is about 25859.6714402948. The cubic root of 668722607 is about 874.4775578383.

The spelling of 668722607 in words is "six hundred sixty-eight million, seven hundred twenty-two thousand, six hundred seven".