663971188 has 12 divisors (see below), whose sum is σ = 1223104960. Its totient is φ = 314512632.

The previous prime is 663971183. The next prime is 663971279. The reversal of 663971188 is 881179366.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663971183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4368156 + ... + 4368307.

Almost surely, 2^663971188 is an apocalyptic number.

It is an amenable number.

663971188 is a deficient number, since it is larger than the sum of its proper divisors (559133772).

663971188 is a wasteful number, since it uses less digits than its factorization.

663971188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8736486 (or 8736484 counting only the distinct ones).

The product of its digits is 435456, while the sum is 49.

The square root of 663971188 is about 25767.6383861618. The cubic root of 663971188 is about 872.4015156365.

The spelling of 663971188 in words is "six hundred sixty-three million, nine hundred seventy-one thousand, one hundred eighty-eight".