666678386 has 16 divisors (see below), whose sum is σ = 1096962048. Its totient is φ = 301359600.

The previous prime is 666678379. The next prime is 666678449. The reversal of 666678386 is 683876666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79730 + ... + 87693.

It is an arithmetic number, because the mean of its divisors is an integer number (68560128).

Almost surely, 2^666678386 is an apocalyptic number.

666678386 is a deficient number, since it is larger than the sum of its proper divisors (430283662).

666678386 is a wasteful number, since it uses less digits than its factorization.

666678386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167617.

The product of its digits is 10450944, while the sum is 56.

The square root of 666678386 is about 25820.1159176329. The cubic root of 666678386 is about 873.5855835966.

The spelling of 666678386 in words is "six hundred sixty-six million, six hundred seventy-eight thousand, three hundred eighty-six".