1666668426 has 16 divisors (see below), whose sum is σ = 3334094400. Its totient is φ = 555429888.

The previous prime is 1666668373. The next prime is 1666668427. The reversal of 1666668426 is 6248666661.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1666668427) 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, 631 + ... + 57738.

It is an arithmetic number, because the mean of its divisors is an integer number (208380900).

Almost surely, 2^1666668426 is an apocalyptic number.

1666668426 is an abundant number, since it is smaller than the sum of its proper divisors (1667425974).

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

1666668426 is a wasteful number, since it uses less digits than its factorization.

1666668426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63133.

The product of its digits is 2985984, while the sum is 51.

The square root of 1666668426 is about 40824.8505937254. The cubic root of 1666668426 is about 1185.6315186806.

The spelling of 1666668426 in words is "one billion, six hundred sixty-six million, six hundred sixty-eight thousand, four hundred twenty-six".