659988899 has 4 divisors (see below), whose sum is σ = 674031264. Its totient is φ = 645946536.

The previous prime is 659988881. The next prime is 659988937. The reversal of 659988899 is 998889956.

659988899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 659988899 - 2⁸ = 659988643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (659981899) 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, 7021112 + ... + 7021205.

It is an arithmetic number, because the mean of its divisors is an integer number (168507816).

Almost surely, 2^659988899 is an apocalyptic number.

659988899 is a deficient number, since it is larger than the sum of its proper divisors (14042365).

659988899 is a wasteful number, since it uses less digits than its factorization.

659988899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14042364.

The product of its digits is 100776960, while the sum is 71.

The square root of 659988899 is about 25690.2491035023. The cubic root of 659988899 is about 870.6538876844.

The spelling of 659988899 in words is "six hundred fifty-nine million, nine hundred eighty-eight thousand, eight hundred ninety-nine".