663646366 has 8 divisors (see below), whose sum is σ = 996240960. Its totient is φ = 331566048.

The previous prime is 663646309. The next prime is 663646367.

663646366 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663646367) 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, 125326 + ... + 130513.

It is an arithmetic number, because the mean of its divisors is an integer number (124530120).

Almost surely, 2^663646366 is an apocalyptic number.

663646366 is a deficient number, since it is larger than the sum of its proper divisors (332594594).

663646366 is a wasteful number, since it uses less digits than its factorization.

663646366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257138.

The product of its digits is 1679616, while the sum is 46.

The square root of 663646366 is about 25761.3347092110. The cubic root of 663646366 is about 872.2592296293.

The spelling of 663646366 in words is "six hundred sixty-three million, six hundred forty-six thousand, three hundred sixty-six".