666394311 has 12 divisors (see below), whose sum is σ = 976644536. Its totient is φ = 403875120.

The previous prime is 666394283. The next prime is 666394319. The reversal of 666394311 is 113493666.

It is not a de Polignac number, because 666394311 - 2¹⁴ = 666377927 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666394311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666394319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 917536 + ... + 918261.

Almost surely, 2^666394311 is an apocalyptic number.

666394311 is a deficient number, since it is larger than the sum of its proper divisors (310250225).

666394311 is a wasteful number, since it uses less digits than its factorization.

666394311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835822 (or 1835811 counting only the distinct ones).

The product of its digits is 69984, while the sum is 39.

The square root of 666394311 is about 25814.6142911336. The cubic root of 666394311 is about 873.4614862377.

The spelling of 666394311 in words is "six hundred sixty-six million, three hundred ninety-four thousand, three hundred eleven".