99966605 has 4 divisors (see below), whose sum is σ = 119959932. Its totient is φ = 79973280.

The previous prime is 99966589. The next prime is 99966631. The reversal of 99966605 is 50666999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50666999 = 23 ⋅2202913.

It can be written as a sum of positive squares in 2 ways, for example, as 57729604 + 42237001 = 7598^2 + 6499^2 .

It is not a de Polignac number, because 99966605 - 2⁴ = 99966589 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 9996656 + ... + 9996665.

It is an arithmetic number, because the mean of its divisors is an integer number (29989983).

Almost surely, 2^99966605 is an apocalyptic number.

It is an amenable number.

99966605 is a deficient number, since it is larger than the sum of its proper divisors (19993327).

99966605 is a wasteful number, since it uses less digits than its factorization.

99966605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19993326.

The product of its (nonzero) digits is 787320, while the sum is 50.

The square root of 99966605 is about 9998.3301105735. The cubic root of 99966605 is about 464.1072089889.

The spelling of 99966605 in words is "ninety-nine million, nine hundred sixty-six thousand, six hundred five".