665204282818 has 16 divisors (see below), whose sum is σ = 1015041108024. Its totient is φ = 326905321600.

The previous prime is 665204282803. The next prime is 665204282819. The reversal of 665204282818 is 818282402566.

It can be written as a sum of positive squares in 4 ways, for example, as 665191941649 + 12341169 = 815593^2 + 3513^2 .

It is a super-2 number, since 2×665204282818² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665204282819) 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 7 ways as a sum of consecutive naturals, for example, 11990905 + ... + 12046252.

Almost surely, 2^665204282818 is an apocalyptic number.

665204282818 is a deficient number, since it is larger than the sum of its proper divisors (349836825206).

665204282818 is a wasteful number, since it uses less digits than its factorization.

665204282818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24037397.

The product of its (nonzero) digits is 2949120, while the sum is 52.

The spelling of 665204282818 in words is "six hundred sixty-five billion, two hundred four million, two hundred eighty-two thousand, eight hundred eighteen".