663918189 has 8 divisors (see below), whose sum is σ = 965699232. Its totient is φ = 402374640.

The previous prime is 663918181. The next prime is 663918191. The reversal of 663918189 is 981819366.

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

It is not a de Polignac number, because 663918189 - 2³ = 663918181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663918181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10059334 + ... + 10059399.

It is an arithmetic number, because the mean of its divisors is an integer number (120712404).

Almost surely, 2^663918189 is an apocalyptic number.

It is an amenable number.

663918189 is a deficient number, since it is larger than the sum of its proper divisors (301781043).

663918189 is a wasteful number, since it uses less digits than its factorization.

663918189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20118747.

The product of its digits is 559872, while the sum is 51.

The square root of 663918189 is about 25766.6099632839. The cubic root of 663918189 is about 872.3783029635.

The spelling of 663918189 in words is "six hundred sixty-three million, nine hundred eighteen thousand, one hundred eighty-nine".