663868868366 has 64 divisors (see below), whose sum is σ = 1170505728000. Its totient is φ = 279237842400.

The previous prime is 663868868353. The next prime is 663868868371.

It is a happy number.

663868868366 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 663868868293 and 663868868302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75272705 + ... + 75281523.

It is an arithmetic number, because the mean of its divisors is an integer number (18289152000).

Almost surely, 2^663868868366 is an apocalyptic number.

663868868366 is a deficient number, since it is larger than the sum of its proper divisors (506636859634).

663868868366 is a wasteful number, since it uses less digits than its factorization.

663868868366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13685.

The product of its digits is 1719926784, while the sum is 74.

The spelling of 663868868366 in words is "six hundred sixty-three billion, eight hundred sixty-eight million, eight hundred sixty-eight thousand, three hundred sixty-six".