665563144 has 32 divisors (see below), whose sum is σ = 1306005120. Its totient is φ = 317380096.

The previous prime is 665563133. The next prime is 665563169. The reversal of 665563144 is 441365566.

It is a junction number, because it is equal to n+sod(n) for n = 665563097 and 665563106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59829 + ... + 70075.

It is an arithmetic number, because the mean of its divisors is an integer number (40812660).

Almost surely, 2^665563144 is an apocalyptic number.

It is an amenable number.

665563144 is a deficient number, since it is larger than the sum of its proper divisors (640441976).

665563144 is a wasteful number, since it uses less digits than its factorization.

665563144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10629 (or 10625 counting only the distinct ones).

The product of its digits is 259200, while the sum is 40.

The square root of 665563144 is about 25798.5104996393. The cubic root of 665563144 is about 873.0981906161.

The spelling of 665563144 in words is "six hundred sixty-five million, five hundred sixty-three thousand, one hundred forty-four".