659998123 has 8 divisors (see below), whose sum is σ = 699099120. Its totient is φ = 620928000.

The previous prime is 659998109. The next prime is 659998127. The reversal of 659998123 is 321899956.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-659998123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (659998127) 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 7 ways as a sum of consecutive naturals, for example, 47748 + ... + 59998.

It is an arithmetic number, because the mean of its divisors is an integer number (87387390).

Almost surely, 2^659998123 is an apocalyptic number.

659998123 is a deficient number, since it is larger than the sum of its proper divisors (39100997).

659998123 is a wasteful number, since it uses less digits than its factorization.

659998123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15437.

The product of its digits is 1049760, while the sum is 52.

The square root of 659998123 is about 25690.4286262413. The cubic root of 659998123 is about 870.6579437497.

The spelling of 659998123 in words is "six hundred fifty-nine million, nine hundred ninety-eight thousand, one hundred twenty-three".