665848566 has 32 divisors (see below), whose sum is σ = 1527398400. Its totient is φ = 214789320.

The previous prime is 665848553. The next prime is 665848567.

It is a happy number.

665848566 is a `hidden beast` number, since 6 + 6 + 584 + 8 + 56 + 6 = 666.

665848566 is nontrivially palindromic in base 10.

665848566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665848567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197206 + ... + 200553.

It is an arithmetic number, because the mean of its divisors is an integer number (47731200).

Almost surely, 2^665848566 is an apocalyptic number.

665848566 is an abundant number, since it is smaller than the sum of its proper divisors (861549834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665848566 is a wasteful number, since it uses less digits than its factorization.

665848566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397801 (or 397795 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 54.

The square root of 665848566 is about 25804.0416601741. The cubic root of 665848566 is about 873.2229800869. Note that the first 3 decimals are identical.

The spelling of 665848566 in words is "six hundred sixty-five million, eight hundred forty-eight thousand, five hundred sixty-six".