663223509 has 12 divisors (see below), whose sum is σ = 1031681196. Its totient is φ = 408137472.

The previous prime is 663223501. The next prime is 663223511. The reversal of 663223509 is 905322366.

It can be written as a sum of positive squares in 2 ways, for example, as 357323409 + 305900100 = 18903^2 + 17490^2 .

It is not a de Polignac number, because 663223509 - 2³ = 663223501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663223501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2834172 + ... + 2834405.

It is an arithmetic number, because the mean of its divisors is an integer number (85973433).

Almost surely, 2^663223509 is an apocalyptic number.

It is an amenable number.

663223509 is a deficient number, since it is larger than the sum of its proper divisors (368457687).

663223509 is a wasteful number, since it uses less digits than its factorization.

663223509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5668596 (or 5668593 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The square root of 663223509 is about 25753.1261985802. The cubic root of 663223509 is about 872.0739304971.

The spelling of 663223509 in words is "six hundred sixty-three million, two hundred twenty-three thousand, five hundred nine".