668697126 has 16 divisors (see below), whose sum is σ = 1370014128. Its totient is φ = 217462400.

The previous prime is 668697119. The next prime is 668697143. The reversal of 668697126 is 621796866.

668697126 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 1358895 + ... + 1359386.

It is an arithmetic number, because the mean of its divisors is an integer number (85625883).

Almost surely, 2^668697126 is an apocalyptic number.

668697126 is an abundant number, since it is smaller than the sum of its proper divisors (701317002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668697126 is a wasteful number, since it uses less digits than its factorization.

668697126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2718327.

The product of its digits is 1306368, while the sum is 51.

The square root of 668697126 is about 25859.1787572614. The cubic root of 668697126 is about 874.4664506690.

The spelling of 668697126 in words is "six hundred sixty-eight million, six hundred ninety-seven thousand, one hundred twenty-six".