659666660 has 12 divisors (see below), whose sum is σ = 1385300028. Its totient is φ = 263866656.

The previous prime is 659666659. The next prime is 659666687. The reversal of 659666660 is 66666956.

It can be written as a sum of positive squares in 2 ways, for example, as 517198564 + 142468096 = 22742^2 + 11936^2 .

It is a junction number, because it is equal to n+sod(n) for n = 659666599 and 659666608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16491647 + ... + 16491686.

It is an arithmetic number, because the mean of its divisors is an integer number (115441669).

Almost surely, 2^659666660 is an apocalyptic number.

It is an amenable number.

659666660 is an abundant number, since it is smaller than the sum of its proper divisors (725633368).

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

659666660 is a wasteful number, since it uses less digits than its factorization.

659666660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32983342 (or 32983340 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 50.

The square root of 659666660 is about 25683.9767170117. The cubic root of 659666660 is about 870.5121659516.

The spelling of 659666660 in words is "six hundred fifty-nine million, six hundred sixty-six thousand, six hundred sixty".