99865999 has 2 divisors, whose sum is σ = 99866000. Its totient is φ = 99865998.

The previous prime is 99865993. The next prime is 99866017. The reversal of 99865999 is 99956899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99865999 - 2³ = 99865991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99865999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99865991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49932999 + 49933000.

It is an arithmetic number, because the mean of its divisors is an integer number (49933000).

Almost surely, 2^99865999 is an apocalyptic number.

99865999 is a deficient number, since it is larger than the sum of its proper divisors (1).

99865999 is an equidigital number, since it uses as much as digits as its factorization.

99865999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14171760, while the sum is 64.

The square root of 99865999 is about 9993.2977039614. The cubic root of 99865999 is about 463.9514648376.

The spelling of 99865999 in words is "ninety-nine million, eight hundred sixty-five thousand, nine hundred ninety-nine".