666683694 has 12 divisors (see below), whose sum is σ = 1444481376. Its totient is φ = 222227892.

The previous prime is 666683623. The next prime is 666683783. The reversal of 666683694 is 496386666.

It is a self number, because there is not a number n which added to its sum of digits gives 666683694.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 18518974 + ... + 18519009.

It is an arithmetic number, because the mean of its divisors is an integer number (120373448).

Almost surely, 2^666683694 is an apocalyptic number.

666683694 is an abundant number, since it is smaller than the sum of its proper divisors (777797682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666683694 is a wasteful number, since it uses less digits than its factorization.

666683694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37037991 (or 37037988 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 54.

The square root of 666683694 is about 25820.2187055029. The cubic root of 666683694 is about 873.5879020459.

The spelling of 666683694 in words is "six hundred sixty-six million, six hundred eighty-three thousand, six hundred ninety-four".