656049666 has 16 divisors (see below), whose sum is σ = 1312517088. Its totient is φ = 218613600.

The previous prime is 656049659. The next prime is 656049697. The reversal of 656049666 is 666940656.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5286 + ... + 36606.

It is an arithmetic number, because the mean of its divisors is an integer number (82032318).

Almost surely, 2^656049666 is an apocalyptic number.

656049666 is an abundant number, since it is smaller than the sum of its proper divisors (656467422).

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

656049666 is a wasteful number, since it uses less digits than its factorization.

656049666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34817.

The product of its (nonzero) digits is 1399680, while the sum is 48.

The square root of 656049666 is about 25613.4664971378. The cubic root of 656049666 is about 868.9182247525.

The spelling of 656049666 in words is "six hundred fifty-six million, forty-nine thousand, six hundred sixty-six".