99664913 has 4 divisors (see below), whose sum is σ = 100579380. Its totient is φ = 98750448.

The previous prime is 99664879. The next prime is 99664921. The reversal of 99664913 is 31946699.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68840209 + 30824704 = 8297^2 + 5552^2 .

It is a cyclic number.

It is not a de Polignac number, because 99664913 - 2⁶ = 99664849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99664933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457070 + ... + 457287.

It is an arithmetic number, because the mean of its divisors is an integer number (25144845).

Almost surely, 2^99664913 is an apocalyptic number.

It is an amenable number.

99664913 is a deficient number, since it is larger than the sum of its proper divisors (914467).

99664913 is a wasteful number, since it uses less digits than its factorization.

99664913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914466.

The product of its digits is 314928, while the sum is 47.

The square root of 99664913 is about 9983.2315910230. The cubic root of 99664913 is about 463.6398578407.

The spelling of 99664913 in words is "ninety-nine million, six hundred sixty-four thousand, nine hundred thirteen".