666477393 has 8 divisors (see below), whose sum is σ = 903698400. Its totient is φ = 436787328.

The previous prime is 666477379. The next prime is 666477419. The reversal of 666477393 is 393774666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666477393 - 2⁴ = 666477377 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (666477353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1882528 + ... + 1882881.

It is an arithmetic number, because the mean of its divisors is an integer number (112962300).

Almost surely, 2^666477393 is an apocalyptic number.

It is an amenable number.

666477393 is a deficient number, since it is larger than the sum of its proper divisors (237221007).

666477393 is a wasteful number, since it uses less digits than its factorization.

666477393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3765471.

The product of its digits is 3429216, while the sum is 51.

The square root of 666477393 is about 25816.2234457327. The cubic root of 666477393 is about 873.4977840223.

The spelling of 666477393 in words is "six hundred sixty-six million, four hundred seventy-seven thousand, three hundred ninety-three".