668448842 has 16 divisors (see below), whose sum is σ = 1057752960. Its totient is φ = 315941472.

The previous prime is 668448817. The next prime is 668448863. The reversal of 668448842 is 248844866.

It is a super-2 number, since 2×668448842² = 893647708742281928, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 1403 + ... + 36590.

It is an arithmetic number, because the mean of its divisors is an integer number (66109560).

Almost surely, 2^668448842 is an apocalyptic number.

668448842 is a deficient number, since it is larger than the sum of its proper divisors (389304118).

668448842 is a wasteful number, since it uses less digits than its factorization.

668448842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38477.

The product of its digits is 2359296, while the sum is 50.

The square root of 668448842 is about 25854.3776177266. The cubic root of 668448842 is about 874.3582088872.

The spelling of 668448842 in words is "six hundred sixty-eight million, four hundred forty-eight thousand, eight hundred forty-two".