666336878 has 16 divisors (see below), whose sum is σ = 1086051840. Its totient is φ = 305451000.

The previous prime is 666336863. The next prime is 666336883. The reversal of 666336878 is 878633666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281648 + ... + 284003.

It is an arithmetic number, because the mean of its divisors is an integer number (67878240).

Almost surely, 2^666336878 is an apocalyptic number.

666336878 is a deficient number, since it is larger than the sum of its proper divisors (419714962).

666336878 is a wasteful number, since it uses less digits than its factorization.

666336878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565703.

The product of its digits is 5225472, while the sum is 53.

The square root of 666336878 is about 25813.5018546496. The cubic root of 666336878 is about 873.4363925086.

The spelling of 666336878 in words is "six hundred sixty-six million, three hundred thirty-six thousand, eight hundred seventy-eight".