668251858 has 16 divisors (see below), whose sum is σ = 1020600000. Its totient is φ = 328090000.

The previous prime is 668251853. The next prime is 668251873. The reversal of 668251858 is 858152866.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (668251853) 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 7 ways as a sum of consecutive naturals, for example, 26268 + ... + 45016.

It is an arithmetic number, because the mean of its divisors is an integer number (63787500).

Almost surely, 2^668251858 is an apocalyptic number.

668251858 is a deficient number, since it is larger than the sum of its proper divisors (352348142).

668251858 is a wasteful number, since it uses less digits than its factorization.

668251858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19073.

The product of its digits is 921600, while the sum is 49.

The square root of 668251858 is about 25850.5678467611. The cubic root of 668251858 is about 874.2723127608.

The spelling of 668251858 in words is "six hundred sixty-eight million, two hundred fifty-one thousand, eight hundred fifty-eight".