668677207 has 4 divisors (see below), whose sum is σ = 729466056. Its totient is φ = 607888360.

The previous prime is 668677187. The next prime is 668677231. The reversal of 668677207 is 702776866.

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-668677207 is a prime.

It is a super-2 number, since 2×668677207² = 894258414322641698, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668678207) 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, 30394408 + ... + 30394429.

It is an arithmetic number, because the mean of its divisors is an integer number (182366514).

Almost surely, 2^668677207 is an apocalyptic number.

668677207 is a deficient number, since it is larger than the sum of its proper divisors (60788849).

668677207 is a wasteful number, since it uses less digits than its factorization.

668677207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60788848.

The product of its (nonzero) digits is 1185408, while the sum is 49.

The square root of 668677207 is about 25858.7936106849. The cubic root of 668677207 is about 874.4577677793.

The spelling of 668677207 in words is "six hundred sixty-eight million, six hundred seventy-seven thousand, two hundred seven".