668867842 has 16 divisors (see below), whose sum is σ = 1036323072. Its totient is φ = 323440560.

The previous prime is 668867821. The next prime is 668867851. The reversal of 668867842 is 248768866.

668867842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150768 + ... + 155140.

It is an arithmetic number, because the mean of its divisors is an integer number (64770192).

Almost surely, 2^668867842 is an apocalyptic number.

668867842 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

668867842 is a deficient number, since it is larger than the sum of its proper divisors (367455230).

668867842 is a wasteful number, since it uses less digits than its factorization.

668867842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6873.

The product of its digits is 6193152, while the sum is 55.

The square root of 668867842 is about 25862.4794248347. The cubic root of 668867842 is about 874.5408603963.

The spelling of 668867842 in words is "six hundred sixty-eight million, eight hundred sixty-seven thousand, eight hundred forty-two".