663645303 has 24 divisors (see below), whose sum is σ = 1047735936. Its totient is φ = 402969600.

The previous prime is 663645233. The next prime is 663645313. The reversal of 663645303 is 303546366.

It is a happy number.

663645303 is a `hidden beast` number, since 6 + 6 + 3 + 645 + 3 + 0 + 3 = 666.

It is not a de Polignac number, because 663645303 - 2⁹ = 663644791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663645313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65218 + ... + 74703.

It is an arithmetic number, because the mean of its divisors is an integer number (43655664).

Almost surely, 2^663645303 is an apocalyptic number.

663645303 is a deficient number, since it is larger than the sum of its proper divisors (384090633).

663645303 is a wasteful number, since it uses less digits than its factorization.

663645303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139975 (or 139972 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 36.

The square root of 663645303 is about 25761.3140775078. The cubic root of 663645303 is about 872.2587639134.

The spelling of 663645303 in words is "six hundred sixty-three million, six hundred forty-five thousand, three hundred three".