665527725566 has 16 divisors (see below), whose sum is σ = 1089349615728. Its totient is φ = 302428089600.

The previous prime is 665527725559. The next prime is 665527725623.

665527725566 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 665527725499 and 665527725508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4145075 + ... + 4302638.

It is an arithmetic number, because the mean of its divisors is an integer number (68084350983).

Almost surely, 2^665527725566 is an apocalyptic number.

665527725566 is a deficient number, since it is larger than the sum of its proper divisors (423821890162).

665527725566 is a wasteful number, since it uses less digits than its factorization.

665527725566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8451307.

The product of its digits is 158760000, while the sum is 62.

The spelling of 665527725566 in words is "six hundred sixty-five billion, five hundred twenty-seven million, seven hundred twenty-five thousand, five hundred sixty-six".