666668337 has 4 divisors (see below), whose sum is σ = 888891120. Its totient is φ = 444445556.

The previous prime is 666668309. The next prime is 666668347. The reversal of 666668337 is 733866666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 666668337 - 2¹¹ = 666666289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666668337.

It is not an unprimeable number, because it can be changed into a prime (666668347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111111387 + ... + 111111392.

It is an arithmetic number, because the mean of its divisors is an integer number (222222780).

Almost surely, 2^666668337 is an apocalyptic number.

It is an amenable number.

666668337 is a deficient number, since it is larger than the sum of its proper divisors (222222783).

666668337 is a wasteful number, since it uses less digits than its factorization.

666668337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222222782.

The product of its digits is 3919104, while the sum is 51.

The square root of 666668337 is about 25819.9213205618. The cubic root of 666668337 is about 873.5811943210.

The spelling of 666668337 in words is "six hundred sixty-six million, six hundred sixty-eight thousand, three hundred thirty-seven".