659990599 has 4 divisors (see below), whose sum is σ = 660078736. Its totient is φ = 659902464.

The previous prime is 659990567. The next prime is 659990647. The reversal of 659990599 is 995099956.

659990599 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 659990599 - 2⁵ = 659990567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659990509) 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, 31674 + ... + 48199.

It is an arithmetic number, because the mean of its divisors is an integer number (165019684).

Almost surely, 2^659990599 is an apocalyptic number.

659990599 is a deficient number, since it is larger than the sum of its proper divisors (88137).

659990599 is an equidigital number, since it uses as much as digits as its factorization.

659990599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88136.

The product of its (nonzero) digits is 8857350, while the sum is 61.

The square root of 659990599 is about 25690.2821899644. The cubic root of 659990599 is about 870.6546352275.

The spelling of 659990599 in words is "six hundred fifty-nine million, nine hundred ninety thousand, five hundred ninety-nine".