99605665 has 16 divisors (see below), whose sum is σ = 123098112. Its totient is φ = 77315904.

The previous prime is 99605651. The next prime is 99605683. The reversal of 99605665 is 56650699.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 99605665 - 2⁷ = 99605537 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 111852 + ... + 112738.

It is an arithmetic number, because the mean of its divisors is an integer number (7693632).

Almost surely, 2^99605665 is an apocalyptic number.

It is an amenable number.

99605665 is a deficient number, since it is larger than the sum of its proper divisors (23492447).

99605665 is a wasteful number, since it uses less digits than its factorization.

99605665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536.

The product of its (nonzero) digits is 437400, while the sum is 46.

The square root of 99605665 is about 9980.2637740693. The cubic root of 99605665 is about 463.5479659916.

It can be divided in two parts, 9960 and 5665, that added together give a 6-th power (15625 = 5⁶).

The spelling of 99605665 in words is "ninety-nine million, six hundred five thousand, six hundred sixty-five".