666955790 has 32 divisors (see below), whose sum is σ = 1213056000. Its totient is φ = 264012448.

The previous prime is 666955789. The next prime is 666955799. The reversal of 666955790 is 97559666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666955799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 427031 + ... + 428589.

It is an arithmetic number, because the mean of its divisors is an integer number (37908000).

Almost surely, 2^666955790 is an apocalyptic number.

666955790 is a deficient number, since it is larger than the sum of its proper divisors (546100210).

666955790 is a wasteful number, since it uses less digits than its factorization.

666955790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984.

The product of its (nonzero) digits is 3061800, while the sum is 53.

The square root of 666955790 is about 25825.4872170885. The cubic root of 666955790 is about 873.7067327325.

The spelling of 666955790 in words is "six hundred sixty-six million, nine hundred fifty-five thousand, seven hundred ninety".