666348385 has 16 divisors (see below), whose sum is σ = 811441152. Its totient is φ = 525251200.

The previous prime is 666348377. The next prime is 666348407. The reversal of 666348385 is 583843666.

It is not a de Polignac number, because 666348385 - 2³ = 666348377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98925 + ... + 105445.

It is an arithmetic number, because the mean of its divisors is an integer number (50715072).

Almost surely, 2^666348385 is an apocalyptic number.

It is an amenable number.

666348385 is a deficient number, since it is larger than the sum of its proper divisors (145092767).

666348385 is a wasteful number, since it uses less digits than its factorization.

666348385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6824.

The product of its digits is 2488320, while the sum is 49.

The square root of 666348385 is about 25813.7247409203. The cubic root of 666348385 is about 873.4414202832.

The spelling of 666348385 in words is "six hundred sixty-six million, three hundred forty-eight thousand, three hundred eighty-five".