668666354 has 16 divisors (see below), whose sum is σ = 1062790080. Its totient is φ = 314636400.

The previous prime is 668666353. The next prime is 668666357. The reversal of 668666354 is 453666866.

It is a super-2 number, since 2×668666354² = 894229385943306632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668666353) 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, 52529 + ... + 64004.

It is an arithmetic number, because the mean of its divisors is an integer number (66424380).

Almost surely, 2^668666354 is an apocalyptic number.

668666354 is a deficient number, since it is larger than the sum of its proper divisors (394123726).

668666354 is a wasteful number, since it uses less digits than its factorization.

668666354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116705.

The product of its digits is 3732480, while the sum is 50.

The square root of 668666354 is about 25858.5837585897. The cubic root of 668666354 is about 874.4530367763.

The spelling of 668666354 in words is "six hundred sixty-eight million, six hundred sixty-six thousand, three hundred fifty-four".