663189506 has 8 divisors (see below), whose sum is σ = 1136896320. Its totient is φ = 284224068.

The previous prime is 663189469. The next prime is 663189539. The reversal of 663189506 is 605981366.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23685326 + ... + 23685353.

It is an arithmetic number, because the mean of its divisors is an integer number (142112040).

Almost surely, 2^663189506 is an apocalyptic number.

663189506 is a deficient number, since it is larger than the sum of its proper divisors (473706814).

663189506 is a wasteful number, since it uses less digits than its factorization.

663189506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47370688.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 663189506 is about 25752.4660178399. The cubic root of 663189506 is about 872.0590267046.

The spelling of 663189506 in words is "six hundred sixty-three million, one hundred eighty-nine thousand, five hundred six".