665995585393 has 4 divisors (see below), whose sum is σ = 667034580708. Its totient is φ = 664956590080.

The previous prime is 665995585363. The next prime is 665995585417. The reversal of 665995585393 is 393585599566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 620869930209 + 45125655184 = 787953^2 + 212428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665995585393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665995585363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 519496696 + ... + 519497977.

It is an arithmetic number, because the mean of its divisors is an integer number (166758645177).

Almost surely, 2^665995585393 is an apocalyptic number.

It is an amenable number.

665995585393 is a deficient number, since it is larger than the sum of its proper divisors (1038995315).

665995585393 is a wasteful number, since it uses less digits than its factorization.

665995585393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038995314.

The product of its digits is 1180980000, while the sum is 73.

The spelling of 665995585393 in words is "six hundred sixty-five billion, nine hundred ninety-five million, five hundred eighty-five thousand, three hundred ninety-three".