99659999 has 4 divisors (see below), whose sum is σ = 99956064. Its totient is φ = 99363936.

The previous prime is 99659983. The next prime is 99660013. The reversal of 99659999 is 99995699.

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 99659999 - 2⁴ = 99659983 is a prime.

It is a Duffinian number.

99659999 is a modest number, since divided by 9999 gives 9965 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99659969) 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, 147527 + ... + 148200.

It is an arithmetic number, because the mean of its divisors is an integer number (24989016).

Almost surely, 2^99659999 is an apocalyptic number.

99659999 is a deficient number, since it is larger than the sum of its proper divisors (296065).

99659999 is a wasteful number, since it uses less digits than its factorization.

99659999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296064.

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

The square root of 99659999 is about 9982.9854752975. The cubic root of 99659999 is about 463.6322377611.

The spelling of 99659999 in words is "ninety-nine million, six hundred fifty-nine thousand, nine hundred ninety-nine".