663556983 has 8 divisors (see below), whose sum is σ = 897204096. Its totient is φ = 436140600.

The previous prime is 663556981. The next prime is 663556987. The reversal of 663556983 is 389655366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 663556983 - 2¹ = 663556981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663556981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1557433 + ... + 1557858.

It is an arithmetic number, because the mean of its divisors is an integer number (112150512).

Almost surely, 2^663556983 is an apocalyptic number.

663556983 is a deficient number, since it is larger than the sum of its proper divisors (233647113).

663556983 is a wasteful number, since it uses less digits than its factorization.

663556983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3115365.

The product of its digits is 3499200, while the sum is 51.

The square root of 663556983 is about 25759.5998222022. The cubic root of 663556983 is about 872.2200678853.

The spelling of 663556983 in words is "six hundred sixty-three million, five hundred fifty-six thousand, nine hundred eighty-three".