668218152 has 32 divisors (see below), whose sum is σ = 1909195200. Its totient is φ = 190919424.

The previous prime is 668218147. The next prime is 668218171. The reversal of 668218152 is 251812866.

It is a self number, because there is not a number n which added to its sum of digits gives 668218152.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1988577 + ... + 1988912.

It is an arithmetic number, because the mean of its divisors is an integer number (59662350).

Almost surely, 2^668218152 is an apocalyptic number.

It is an amenable number.

668218152 is an abundant number, since it is smaller than the sum of its proper divisors (1240977048).

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

668218152 is a wasteful number, since it uses less digits than its factorization.

668218152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3977505 (or 3977501 counting only the distinct ones).

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

The square root of 668218152 is about 25849.9158992829. The cubic root of 668218152 is about 874.2576133538.

The spelling of 668218152 in words is "six hundred sixty-eight million, two hundred eighteen thousand, one hundred fifty-two".