665357753566 has 16 divisors (see below), whose sum is σ = 1098755927280. Its totient is φ = 299660705280.

The previous prime is 665357753549. The next prime is 665357753617.

665357753566 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 665357753498 and 665357753507.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138729411 + ... + 138734206.

It is an arithmetic number, because the mean of its divisors is an integer number (68672245455).

Almost surely, 2^665357753566 is an apocalyptic number.

665357753566 is a deficient number, since it is larger than the sum of its proper divisors (433398173714).

665357753566 is a wasteful number, since it uses less digits than its factorization.

665357753566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277463739.

The product of its digits is 357210000, while the sum is 64.

The spelling of 665357753566 in words is "six hundred sixty-five billion, three hundred fifty-seven million, seven hundred fifty-three thousand, five hundred sixty-six".