999609665 has 8 divisors (see below), whose sum is σ = 1262664960. Its totient is φ = 757598832.

The previous prime is 999609661. The next prime is 999609763. The reversal of 999609665 is 566906999.

999609665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999609665 - 2² = 999609661 is a prime.

It is a super-2 number, since 2×999609665² = 1998438964722824450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (999609661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5261009 + ... + 5261198.

It is an arithmetic number, because the mean of its divisors is an integer number (157833120).

Almost surely, 2^999609665 is an apocalyptic number.

999609665 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

999609665 is a deficient number, since it is larger than the sum of its proper divisors (263055295).

999609665 is a wasteful number, since it uses less digits than its factorization.

999609665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10522231.

The product of its (nonzero) digits is 7085880, while the sum is 59.

The square root of 999609665 is about 31616.6042610525. The cubic root of 999609665 is about 999.8698714006.

The spelling of 999609665 in words is "nine hundred ninety-nine million, six hundred nine thousand, six hundred sixty-five".