99865625 has 12 divisors (see below), whose sum is σ = 124827948. Its totient is φ = 79890000.

The previous prime is 99865613. The next prime is 99865637. The reversal of 99865625 is 52656899.

It is an interprime number because it is at equal distance from previous prime (99865613) and next prime (99865637).

It can be written as a sum of positive squares in 6 ways, for example, as 68773849 + 31091776 = 8293^2 + 5576^2 .

It is not a de Polignac number, because 99865625 - 2¹⁶ = 99800089 is a prime.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12854 + ... + 19103.

It is an arithmetic number, because the mean of its divisors is an integer number (10402329).

Almost surely, 2^99865625 is an apocalyptic number.

It is an amenable number.

99865625 is a deficient number, since it is larger than the sum of its proper divisors (24962323).

99865625 is an frugal number, since it uses more digits than its factorization.

99865625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31982 (or 31962 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 50.

The square root of 99865625 is about 9993.2789914022. The cubic root of 99865625 is about 463.9508856680.

The spelling of 99865625 in words is "ninety-nine million, eight hundred sixty-five thousand, six hundred twenty-five".