668666682 has 12 divisors (see below), whose sum is σ = 1448777850. Its totient is φ = 222888888.

The previous prime is 668666681. The next prime is 668666693. The reversal of 668666682 is 286666866.

It can be written as a sum of positive squares in only one way, i.e., 454073481 + 214593201 = 21309^2 + 14649^2 .

It is not an unprimeable number, because it can be changed into a prime (668666681) 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 5 ways as a sum of consecutive naturals, for example, 18574057 + ... + 18574092.

Almost surely, 2^668666682 is an apocalyptic number.

668666682 is an abundant number, since it is smaller than the sum of its proper divisors (780111168).

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

668666682 is a wasteful number, since it uses less digits than its factorization.

668666682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37148157 (or 37148154 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 54.

The square root of 668666682 is about 25858.5901007770. The cubic root of 668666682 is about 874.4531797577.

The spelling of 668666682 in words is "six hundred sixty-eight million, six hundred sixty-six thousand, six hundred eighty-two".