665660304513 has 6 divisors (see below), whose sum is σ = 961509328754. Its totient is φ = 443773536336.

The previous prime is 665660304493. The next prime is 665660304521. The reversal of 665660304513 is 315403066566.

665660304513 is a `hidden beast` number, since 6 + 6 + 566 + 0 + 30 + 4 + 51 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 660330136449 + 5330168064 = 812607^2 + 73008^2 .

It is not a de Polignac number, because 665660304513 - 2¹⁶ = 665660238977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665660304013) 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 5 ways as a sum of consecutive naturals, for example, 36981128020 + ... + 36981128037.

Almost surely, 2^665660304513 is an apocalyptic number.

It is an amenable number.

665660304513 is a deficient number, since it is larger than the sum of its proper divisors (295849024241).

665660304513 is a wasteful number, since it uses less digits than its factorization.

665660304513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73962256063 (or 73962256060 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 45.

The spelling of 665660304513 in words is "six hundred sixty-five billion, six hundred sixty million, three hundred four thousand, five hundred thirteen".