665043343340566 has 4 divisors (see below), whose sum is σ = 997565015010852. Its totient is φ = 332521671670282.

The previous prime is 665043343340449. The next prime is 665043343340573.

665043343340566 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×665043343340566² (a number of 30 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 665043343340566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166260835835140 + ... + 166260835835143.

It is an arithmetic number, because the mean of its divisors is an integer number (249391253752713).

Almost surely, 2^{665043343340566} is an apocalyptic number.

665043343340566 is a deficient number, since it is larger than the sum of its proper divisors (332521671670286).

665043343340566 is a wasteful number, since it uses less digits than its factorization.

665043343340566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332521671670285.

The product of its (nonzero) digits is 167961600, while the sum is 58.

The spelling of 665043343340566 in words is "six hundred sixty-five trillion, forty-three billion, three hundred forty-three million, three hundred forty thousand, five hundred sixty-six".