663532643 has 4 divisors (see below), whose sum is σ = 679716408. Its totient is φ = 647348880.

The previous prime is 663532637. The next prime is 663532651. The reversal of 663532643 is 346235366.

663532643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 663532643 - 2²⁴ = 646755427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 663532597 and 663532606.

It is not an unprimeable number, because it can be changed into a prime (663532603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8091821 + ... + 8091902.

It is an arithmetic number, because the mean of its divisors is an integer number (169929102).

Almost surely, 2^663532643 is an apocalyptic number.

663532643 is a deficient number, since it is larger than the sum of its proper divisors (16183765).

663532643 is a wasteful number, since it uses less digits than its factorization.

663532643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16183764.

The product of its digits is 233280, while the sum is 38.

The square root of 663532643 is about 25759.1273726421. The cubic root of 663532643 is about 872.2094030911.

The spelling of 663532643 in words is "six hundred sixty-three million, five hundred thirty-two thousand, six hundred forty-three".