666879895 has 16 divisors (see below), whose sum is σ = 876344832. Its totient is φ = 483148960.

The previous prime is 666879833. The next prime is 666879901. The reversal of 666879895 is 598978666.

It is not a de Polignac number, because 666879895 - 2¹⁵ = 666847127 is a prime.

It is a super-2 number, since 2×666879895² = 889457588710422050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8587 + ... + 37516.

It is an arithmetic number, because the mean of its divisors is an integer number (54771552).

Almost surely, 2^666879895 is an apocalyptic number.

666879895 is a deficient number, since it is larger than the sum of its proper divisors (209464937).

666879895 is a wasteful number, since it uses less digits than its factorization.

666879895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46382.

The product of its digits is 39191040, while the sum is 64.

The square root of 666879895 is about 25824.0177935193. The cubic root of 666879895 is about 873.6735908617.

The spelling of 666879895 in words is "six hundred sixty-six million, eight hundred seventy-nine thousand, eight hundred ninety-five".