663641206 has 16 divisors (see below), whose sum is σ = 1059851520. Its totient is φ = 310573440.

The previous prime is 663641179. The next prime is 663641207. The reversal of 663641206 is 602146366.

It is a super-2 number, since 2×663641206² = 880839300602268872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663641207) 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, 47766 + ... + 60073.

It is an arithmetic number, because the mean of its divisors is an integer number (66240720).

Almost surely, 2^663641206 is an apocalyptic number.

663641206 is a deficient number, since it is larger than the sum of its proper divisors (396210314).

663641206 is a wasteful number, since it uses less digits than its factorization.

663641206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108039.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 663641206 is about 25761.2345589259. The cubic root of 663641206 is about 872.2569689528.

The spelling of 663641206 in words is "six hundred sixty-three million, six hundred forty-one thousand, two hundred six".