1666668874 has 12 divisors (see below), whose sum is σ = 2707104726. Its totient is φ = 769231632.

The previous prime is 1666668869. The next prime is 1666668877. The reversal of 1666668874 is 4788666661.

It can be written as a sum of positive squares in 3 ways, for example, as 1365819849 + 300849025 = 36957^2 + 17345^2 .

It is not an unprimeable number, because it can be changed into a prime (1666668877) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2465149 + ... + 2465824.

Almost surely, 2^1666668874 is an apocalyptic number.

1666668874 is a deficient number, since it is larger than the sum of its proper divisors (1040435852).

1666668874 is a wasteful number, since it uses less digits than its factorization.

1666668874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4931001 (or 4930988 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 58.

The square root of 1666668874 is about 40824.8560805791. The cubic root of 1666668874 is about 1185.6316249131.

The spelling of 1666668874 in words is "one billion, six hundred sixty-six million, six hundred sixty-eight thousand, eight hundred seventy-four".