668118252 has 12 divisors (see below), whose sum is σ = 1558942616. Its totient is φ = 222706080.

The previous prime is 668118239. The next prime is 668118257. The reversal of 668118252 is 252811866.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 668118252.

It is not an unprimeable number, because it can be changed into a prime (668118257) 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 3 ways as a sum of consecutive naturals, for example, 27838249 + ... + 27838272.

Almost surely, 2^668118252 is an apocalyptic number.

It is an amenable number.

668118252 is an abundant number, since it is smaller than the sum of its proper divisors (890824364).

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

668118252 is a wasteful number, since it uses less digits than its factorization.

668118252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55676528 (or 55676526 counting only the distinct ones).

The product of its digits is 46080, while the sum is 39.

The square root of 668118252 is about 25847.9835190291. The cubic root of 668118252 is about 874.2140434069.

The spelling of 668118252 in words is "six hundred sixty-eight million, one hundred eighteen thousand, two hundred fifty-two".