990665683 has 24 divisors (see below), whose sum is σ = 1205459712. Its totient is φ = 810233424.

The previous prime is 990665677. The next prime is 990665707. The reversal of 990665683 is 386566099.

It is a happy number.

It is not a de Polignac number, because 990665683 - 2⁵ = 990665651 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 990665683.

It is not an unprimeable number, because it can be changed into a prime (990665603) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 615666 + ... + 617272.

It is an arithmetic number, because the mean of its divisors is an integer number (50227488).

Almost surely, 2^990665683 is an apocalyptic number.

990665683 is a deficient number, since it is larger than the sum of its proper divisors (214794029).

990665683 is a wasteful number, since it uses less digits than its factorization.

990665683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191 (or 2184 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 52.

The square root of 990665683 is about 31474.8420647348. The cubic root of 990665683 is about 996.8788294294.

The spelling of 990665683 in words is "nine hundred ninety million, six hundred sixty-five thousand, six hundred eighty-three".