668737252 has 12 divisors (see below), whose sum is σ = 1192371516. Its totient is φ = 328059680.

The previous prime is 668737231. The next prime is 668737309. The reversal of 668737252 is 252737866.

It can be written as a sum of positive squares in 2 ways, for example, as 171714816 + 497022436 = 13104^2 + 22294^2 .

It is an unprimeable number.

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, 1576999 + ... + 1577422.

It is an arithmetic number, because the mean of its divisors is an integer number (99364293).

Almost surely, 2^668737252 is an apocalyptic number.

It is an amenable number.

668737252 is a deficient number, since it is larger than the sum of its proper divisors (523634264).

668737252 is a wasteful number, since it uses less digits than its factorization.

668737252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3154478 (or 3154476 counting only the distinct ones).

The product of its digits is 846720, while the sum is 46.

The square root of 668737252 is about 25859.9546016616. The cubic root of 668737252 is about 874.4839414669.

The spelling of 668737252 in words is "six hundred sixty-eight million, seven hundred thirty-seven thousand, two hundred fifty-two".