99999659 has 4 divisors (see below), whose sum is σ = 100217040. Its totient is φ = 99782280.

The previous prime is 99999643. The next prime is 99999677. The reversal of 99999659 is 95699999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99999659 - 2⁴ = 99999643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99999595 and 99999604.

It is not an unprimeable number, because it can be changed into a prime (99999259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107999 + ... + 108920.

It is an arithmetic number, because the mean of its divisors is an integer number (25054260).

Almost surely, 2^99999659 is an apocalyptic number.

99999659 is a deficient number, since it is larger than the sum of its proper divisors (217381).

99999659 is a wasteful number, since it uses less digits than its factorization.

99999659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217380.

The product of its digits is 15943230, while the sum is 65.

The square root of 99999659 is about 9999.9829499855. The cubic root of 99999659 is about 464.1583557667.

The spelling of 99999659 in words is "ninety-nine million, nine hundred ninety-nine thousand, six hundred fifty-nine".