663806608366 has 32 divisors (see below), whose sum is σ = 1145786342400. Its totient is φ = 285252886080.

The previous prime is 663806608331. The next prime is 663806608427.

It is a happy number.

663806608366 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 663806608366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1457455 + ... + 1857898.

It is an arithmetic number, because the mean of its divisors is an integer number (35805823200).

Almost surely, 2^663806608366 is an apocalyptic number.

663806608366 is a deficient number, since it is larger than the sum of its proper divisors (481979734034).

663806608366 is a wasteful number, since it uses less digits than its factorization.

663806608366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3315864.

The product of its (nonzero) digits is 26873856, while the sum is 58.

The spelling of 663806608366 in words is "six hundred sixty-three billion, eight hundred six million, six hundred eight thousand, three hundred sixty-six".