663563645 has 32 divisors (see below), whose sum is σ = 843091200. Its totient is φ = 500645376.

The previous prime is 663563627. The next prime is 663563647. The reversal of 663563645 is 546365366.

It is a cyclic number.

It is not a de Polignac number, because 663563645 - 2¹⁰ = 663562621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 663563596 and 663563605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663563647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1622201 + ... + 1622609.

It is an arithmetic number, because the mean of its divisors is an integer number (26346600).

Almost surely, 2^663563645 is an apocalyptic number.

It is an amenable number.

663563645 is a deficient number, since it is larger than the sum of its proper divisors (179527555).

663563645 is a wasteful number, since it uses less digits than its factorization.

663563645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677.

The product of its digits is 1166400, while the sum is 44.

The square root of 663563645 is about 25759.7291328927. The cubic root of 663563645 is about 872.2229868563. Note that the first 3 decimals are identical.

The spelling of 663563645 in words is "six hundred sixty-three million, five hundred sixty-three thousand, six hundred forty-five".