665168231144 has 32 divisors (see below), whose sum is σ = 1274969894400. Its totient is φ = 325235287680.

The previous prime is 665168231141. The next prime is 665168231159. The reversal of 665168231144 is 441132861566.

It is not an unprimeable number, because it can be changed into a prime (665168231141) 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, 3598997 + ... + 3779300.

It is an arithmetic number, because the mean of its divisors is an integer number (39842809200).

Almost surely, 2^665168231144 is an apocalyptic number.

It is an amenable number.

665168231144 is a deficient number, since it is larger than the sum of its proper divisors (609801663256).

665168231144 is a wasteful number, since it uses less digits than its factorization.

665168231144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7378553 (or 7378549 counting only the distinct ones).

The product of its digits is 829440, while the sum is 47.

The spelling of 665168231144 in words is "six hundred sixty-five billion, one hundred sixty-eight million, two hundred thirty-one thousand, one hundred forty-four".