668363866 has 8 divisors (see below), whose sum is σ = 1002698784. Its totient is φ = 334130940.

The previous prime is 668363863. The next prime is 668363869.

It is a happy number.

668363866 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (668363863) and next prime (668363869).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (668363863) 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 3 ways as a sum of consecutive naturals, for example, 6190 + ... + 37081.

It is an arithmetic number, because the mean of its divisors is an integer number (125337348).

Almost surely, 2^668363866 is an apocalyptic number.

668363866 is a deficient number, since it is larger than the sum of its proper divisors (334334918).

668363866 is a wasteful number, since it uses less digits than its factorization.

668363866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50996.

The product of its digits is 4478976, while the sum is 52.

The square root of 668363866 is about 25852.7342074296. The cubic root of 668363866 is about 874.3211566317.

The spelling of 668363866 in words is "six hundred sixty-eight million, three hundred sixty-three thousand, eight hundred sixty-six".