668242866 has 32 divisors (see below), whose sum is σ = 1386243648. Its totient is φ = 214574400.

The previous prime is 668242849. The next prime is 668242867.

668242866 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (668242867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7521 + ... + 37323.

It is an arithmetic number, because the mean of its divisors is an integer number (43320114).

Almost surely, 2^668242866 is an apocalyptic number.

668242866 is an abundant number, since it is smaller than the sum of its proper divisors (718000782).

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

668242866 is a wasteful number, since it uses less digits than its factorization.

668242866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29946.

The product of its digits is 1327104, while the sum is 48.

The square root of 668242866 is about 25850.3939234976. The cubic root of 668242866 is about 874.2683913391.

The spelling of 668242866 in words is "six hundred sixty-eight million, two hundred forty-two thousand, eight hundred sixty-six".