99865605 has 16 divisors (see below), whose sum is σ = 182611584. Its totient is φ = 45652800.

The previous prime is 99865603. The next prime is 99865613. The reversal of 99865605 is 50656899.

It is not a de Polignac number, because 99865605 - 2¹ = 99865603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99865603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 475446 + ... + 475655.

It is an arithmetic number, because the mean of its divisors is an integer number (11413224).

Almost surely, 2^99865605 is an apocalyptic number.

It is an amenable number.

99865605 is a deficient number, since it is larger than the sum of its proper divisors (82745979).

99865605 is a wasteful number, since it uses less digits than its factorization.

99865605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951116.

The product of its (nonzero) digits is 583200, while the sum is 48.

The square root of 99865605 is about 9993.2779907296. The cubic root of 99865605 is about 463.9508546963.

The spelling of 99865605 in words is "ninety-nine million, eight hundred sixty-five thousand, six hundred five".