663643306 has 4 divisors (see below), whose sum is σ = 995464962. Its totient is φ = 331821652.

The previous prime is 663643303. The next prime is 663643307. The reversal of 663643306 is 603346366.

663643306 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 can be written as a sum of positive squares in only one way, i.e., 608066281 + 55577025 = 24659^2 + 7455^2 .

It is not an unprimeable number, because it can be changed into a prime (663643301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165910825 + ... + 165910828.

Almost surely, 2^663643306 is an apocalyptic number.

663643306 is a deficient number, since it is larger than the sum of its proper divisors (331821656).

663643306 is a wasteful number, since it uses less digits than its factorization.

663643306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331821655.

The product of its (nonzero) digits is 139968, while the sum is 37.

The square root of 663643306 is about 25761.2753178099. The cubic root of 663643306 is about 872.2578889970.

The spelling of 663643306 in words is "six hundred sixty-three million, six hundred forty-three thousand, three hundred six".