9990000665 has 16 divisors (see below), whose sum is σ = 12516052608. Its totient is φ = 7640345856.

The previous prime is 9990000661. The next prime is 9990000667. The reversal of 9990000665 is 5660000999.

It is a cyclic number.

It is not a de Polignac number, because 9990000665 - 2² = 9990000661 is a prime.

It is a super-2 number, since 2×9990000665² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9990000661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196529 + ... + 242081.

It is an arithmetic number, because the mean of its divisors is an integer number (782253288).

Almost surely, 2^9990000665 is an apocalyptic number.

It is an amenable number.

9990000665 is a deficient number, since it is larger than the sum of its proper divisors (2526051943).

9990000665 is a wasteful number, since it uses less digits than its factorization.

9990000665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47488.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 9990000665 is about 99949.9908204098. The cubic root of 9990000665 is about 2153.7163534090.

The spelling of 9990000665 in words is "nine billion, nine hundred ninety million, six hundred sixty-five", and thus it is an aban number.