1668810726 has 24 divisors (see below), whose sum is σ = 3944462184. Its totient is φ = 505700160.

The previous prime is 1668810709. The next prime is 1668810749. The reversal of 1668810726 is 6270188661.

It is a happy number.

1668810726 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4213971 + ... + 4214366.

It is an arithmetic number, because the mean of its divisors is an integer number (164352591).

Almost surely, 2^1668810726 is an apocalyptic number.

1668810726 is an abundant number, since it is smaller than the sum of its proper divisors (2275651458).

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

1668810726 is a wasteful number, since it uses less digits than its factorization.

1668810726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8428356 (or 8428353 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 1668810726 is about 40851.0798633280. The cubic root of 1668810726 is about 1186.1392963248.

The spelling of 1668810726 in words is "one billion, six hundred sixty-eight million, eight hundred ten thousand, seven hundred twenty-six".