668676895 has 16 divisors (see below), whose sum is σ = 850251168. Its totient is φ = 503096320.

The previous prime is 668676859. The next prime is 668676917. The reversal of 668676895 is 598676866.

It is not a de Polignac number, because 668676895 - 2¹⁵ = 668644127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 170355 + ... + 174235.

It is an arithmetic number, because the mean of its divisors is an integer number (53140698).

Almost surely, 2^668676895 is an apocalyptic number.

668676895 is a deficient number, since it is larger than the sum of its proper divisors (181574273).

668676895 is a wasteful number, since it uses less digits than its factorization.

668676895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5930.

The product of its digits is 26127360, while the sum is 61.

The square root of 668676895 is about 25858.7875779202. The cubic root of 668676895 is about 874.4576317740.

The spelling of 668676895 in words is "six hundred sixty-eight million, six hundred seventy-six thousand, eight hundred ninety-five".