665396393 has 4 divisors (see below), whose sum is σ = 666322560. Its totient is φ = 664470228.

The previous prime is 665396341. The next prime is 665396447. The reversal of 665396393 is 393693566.

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 665396393 - 2¹⁰ = 665395369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (665396993) 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, 462005 + ... + 463442.

It is an arithmetic number, because the mean of its divisors is an integer number (166580640).

Almost surely, 2^665396393 is an apocalyptic number.

It is an amenable number.

665396393 is a deficient number, since it is larger than the sum of its proper divisors (926167).

665396393 is an equidigital number, since it uses as much as digits as its factorization.

665396393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926166.

The product of its digits is 2361960, while the sum is 50.

The square root of 665396393 is about 25795.2785020825. The cubic root of 665396393 is about 873.0252688314.

The spelling of 665396393 in words is "six hundred sixty-five million, three hundred ninety-six thousand, three hundred ninety-three".