665434818313 has 4 divisors (see below), whose sum is σ = 665454254740. Its totient is φ = 665415381888.

The previous prime is 665434818259. The next prime is 665434818383. The reversal of 665434818313 is 313818434566.

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 616581441529 + 48853376784 = 785227^2 + 221028^2 .

It is a cyclic number.

It is not a de Polignac number, because 665434818313 - 2²⁵ = 665401263881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665434818383) 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, 9666768 + ... + 9735361.

It is an arithmetic number, because the mean of its divisors is an integer number (166363563685).

Almost surely, 2^665434818313 is an apocalyptic number.

It is an amenable number.

665434818313 is a deficient number, since it is larger than the sum of its proper divisors (19436427).

665434818313 is a wasteful number, since it uses less digits than its factorization.

665434818313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19436426.

The product of its digits is 4976640, while the sum is 52.

The spelling of 665434818313 in words is "six hundred sixty-five billion, four hundred thirty-four million, eight hundred eighteen thousand, three hundred thirteen".