665563443 has 32 divisors (see below), whose sum is σ = 948879360. Its totient is φ = 414062880.

The previous prime is 665563441. The next prime is 665563469. The reversal of 665563443 is 344365566.

It is a happy number.

It is not a de Polignac number, because 665563443 - 2¹ = 665563441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665563395 and 665563404.

It is not an unprimeable number, because it can be changed into a prime (665563441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 503938 + ... + 505256.

It is an arithmetic number, because the mean of its divisors is an integer number (29652480).

Almost surely, 2^665563443 is an apocalyptic number.

665563443 is a deficient number, since it is larger than the sum of its proper divisors (283315917).

665563443 is a wasteful number, since it uses less digits than its factorization.

665563443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1519.

The product of its digits is 777600, while the sum is 42.

The square root of 665563443 is about 25798.5162945469. The cubic root of 665563443 is about 873.0983213607.

The spelling of 665563443 in words is "six hundred sixty-five million, five hundred sixty-three thousand, four hundred forty-three".