99866019 has 24 divisors (see below), whose sum is σ = 147836416. Its totient is φ = 59914800.

The previous prime is 99866017. The next prime is 99866021. The reversal of 99866019 is 91066899.

It is an interprime number because it is at equal distance from previous prime (99866017) and next prime (99866021).

It is not a de Polignac number, because 99866019 - 2¹ = 99866017 is a prime.

It is a super-2 number, since 2×99866019² = 19946443501816722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99866017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36054 + ... + 38724.

Almost surely, 2^99866019 is an apocalyptic number.

99866019 is the 5342-nd nonagonal number.

99866019 is a deficient number, since it is larger than the sum of its proper divisors (47970397).

99866019 is a wasteful number, since it uses less digits than its factorization.

99866019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2799 (or 2788 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 99866019 is about 9993.2987046320. The cubic root of 99866019 is about 463.9514958092.

The spelling of 99866019 in words is "ninety-nine million, eight hundred sixty-six thousand, nineteen".