668140677 has 16 divisors (see below), whose sum is σ = 994207680. Its totient is φ = 443460816.

The previous prime is 668140609. The next prime is 668140699. The reversal of 668140677 is 776041866.

It is a de Polignac number, because none of the positive numbers 2^k-668140677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668142677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48378 + ... + 60635.

It is an arithmetic number, because the mean of its divisors is an integer number (62137980).

Almost surely, 2^668140677 is an apocalyptic number.

It is an amenable number.

668140677 is a deficient number, since it is larger than the sum of its proper divisors (326067003).

668140677 is a wasteful number, since it uses less digits than its factorization.

668140677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109249 (or 109243 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 668140677 is about 25848.4173016454. The cubic root of 668140677 is about 874.2238241258.

The spelling of 668140677 in words is "six hundred sixty-eight million, one hundred forty thousand, six hundred seventy-seven".