659557998 has 32 divisors (see below), whose sum is σ = 1598929920. Its totient is φ = 199865880.

The previous prime is 659557981. The next prime is 659558033. The reversal of 659557998 is 899755956.

659557998 is a `hidden beast` number, since 6 + 59 + 5 + 579 + 9 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 554590 + ... + 555777.

It is an arithmetic number, because the mean of its divisors is an integer number (49966560).

Almost surely, 2^659557998 is an apocalyptic number.

659557998 is an abundant number, since it is smaller than the sum of its proper divisors (939371922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

659557998 is a wasteful number, since it uses less digits than its factorization.

659557998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110389 (or 1110383 counting only the distinct ones).

The product of its digits is 30618000, while the sum is 63.

The square root of 659557998 is about 25681.8612643243. The cubic root of 659557998 is about 870.4643656543.

The spelling of 659557998 in words is "six hundred fifty-nine million, five hundred fifty-seven thousand, nine hundred ninety-eight".