666408790 has 16 divisors (see below), whose sum is σ = 1208694960. Its totient is φ = 264528160.

The previous prime is 666408761. The next prime is 666408859. The reversal of 666408790 is 97804666.

It is a self number, because there is not a number n which added to its sum of digits gives 666408790.

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 7 ways as a sum of consecutive naturals, for example, 253045 + ... + 255664.

It is an arithmetic number, because the mean of its divisors is an integer number (75543435).

Almost surely, 2^666408790 is an apocalyptic number.

666408790 is a deficient number, since it is larger than the sum of its proper divisors (542286170).

666408790 is a wasteful number, since it uses less digits than its factorization.

666408790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508847.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 666408790 is about 25814.8947315305. The cubic root of 666408790 is about 873.4678122007.

The spelling of 666408790 in words is "six hundred sixty-six million, four hundred eight thousand, seven hundred ninety".