663633663 has 64 divisors (see below), whose sum is σ = 1145954304. Its totient is φ = 331632000.

The previous prime is 663633643. The next prime is 663633671. The reversal of 663633663 is 366336366.

It is not a de Polignac number, because 663633663 - 2⁶ = 663633599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663633643) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 704773 + ... + 705713.

It is an arithmetic number, because the mean of its divisors is an integer number (17905536).

Almost surely, 2^663633663 is an apocalyptic number.

663633663 is a deficient number, since it is larger than the sum of its proper divisors (482320641).

663633663 is a wasteful number, since it uses less digits than its factorization.

663633663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076.

The product of its digits is 629856, while the sum is 42.

The square root of 663633663 is about 25761.0881563648. The cubic root of 663633663 is about 872.2536642257.

The spelling of 663633663 in words is "six hundred sixty-three million, six hundred thirty-three thousand, six hundred sixty-three".