99664775 has 18 divisors (see below), whose sum is σ = 143763120. Its totient is φ = 68340720.

The previous prime is 99664753. The next prime is 99664777. The reversal of 99664775 is 57746699.

It is not a de Polignac number, because 99664775 - 2¹⁶ = 99599239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99664777) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 39455 + ... + 41904.

It is an arithmetic number, because the mean of its divisors is an integer number (7986840).

Almost surely, 2^99664775 is an apocalyptic number.

99664775 is a deficient number, since it is larger than the sum of its proper divisors (44098345).

99664775 is a wasteful number, since it uses less digits than its factorization.

99664775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81383 (or 81371 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 53.

The square root of 99664775 is about 9983.2246794310. The cubic root of 99664775 is about 463.6396438492.

It can be divided in two parts, 9966 and 4775, that added together give a palindrome (14741).

The spelling of 99664775 in words is "ninety-nine million, six hundred sixty-four thousand, seven hundred seventy-five".