665588393 has 2 divisors, whose sum is σ = 665588394. Its totient is φ = 665588392.

The previous prime is 665588387. The next prime is 665588431. The reversal of 665588393 is 393885566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522259609 + 143328784 = 22853^2 + 11972^2 .

It is a cyclic number.

It is not a de Polignac number, because 665588393 - 2¹⁰ = 665587369 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (665588093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332794196 + 332794197.

It is an arithmetic number, because the mean of its divisors is an integer number (332794197).

Almost surely, 2^665588393 is an apocalyptic number.

It is an amenable number.

665588393 is a deficient number, since it is larger than the sum of its proper divisors (1).

665588393 is an equidigital number, since it uses as much as digits as its factorization.

665588393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 53.

The square root of 665588393 is about 25798.9998449552. Note that the first 3 decimals coincide. The cubic root of 665588393 is about 873.1092311801.

The spelling of 665588393 in words is "six hundred sixty-five million, five hundred eighty-eight thousand, three hundred ninety-three".