668852144 has 20 divisors (see below), whose sum is σ = 1352245296. Its totient is φ = 319885632.

The previous prime is 668852141. The next prime is 668852153. The reversal of 668852144 is 441258866.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 668852095 and 668852104.

It is not an unprimeable number, because it can be changed into a prime (668852141) 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, 908399 + ... + 909134.

Almost surely, 2^668852144 is an apocalyptic number.

It is an amenable number.

668852144 is an abundant number, since it is smaller than the sum of its proper divisors (683393152).

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

668852144 is a wasteful number, since it uses less digits than its factorization.

668852144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817564 (or 1817558 counting only the distinct ones).

The product of its digits is 368640, while the sum is 44.

The square root of 668852144 is about 25862.1759332041. The cubic root of 668852144 is about 874.5340186612.

The spelling of 668852144 in words is "six hundred sixty-eight million, eight hundred fifty-two thousand, one hundred forty-four".