665567841 has 8 divisors (see below), whose sum is σ = 887544640. Its totient is φ = 443651472.

The previous prime is 665567839. The next prime is 665567857. The reversal of 665567841 is 148765566.

665567841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665567841 - 2¹ = 665567839 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665567831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28956 + ... + 46578.

It is an arithmetic number, because the mean of its divisors is an integer number (110943080).

Almost surely, 2^665567841 is an apocalyptic number.

It is an amenable number.

665567841 is a deficient number, since it is larger than the sum of its proper divisors (221976799).

665567841 is a wasteful number, since it uses less digits than its factorization.

665567841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30215.

The product of its digits is 1209600, while the sum is 48.

The square root of 665567841 is about 25798.6015318660. The cubic root of 665567841 is about 873.1002444821.

The spelling of 665567841 in words is "six hundred sixty-five million, five hundred sixty-seven thousand, eight hundred forty-one".