990899966 has 36 divisors (see below), whose sum is σ = 1745347128. Its totient is φ = 413313864.

The previous prime is 990899941. The next prime is 990899969. The reversal of 990899966 is 669998099.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990899969) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5535665 + ... + 5535843.

Almost surely, 2^990899966 is an apocalyptic number.

990899966 is a deficient number, since it is larger than the sum of its proper divisors (754447162).

990899966 is an equidigital number, since it uses as much as digits as its factorization.

990899966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 17006112, while the sum is 65.

The square root of 990899966 is about 31478.5635949292. The cubic root of 990899966 is about 996.9574073521.

The spelling of 990899966 in words is "nine hundred ninety million, eight hundred ninety-nine thousand, nine hundred sixty-six".