663881188366 has 16 divisors (see below), whose sum is σ = 1086471175680. Its totient is φ = 301730804280.

The previous prime is 663881188343. The next prime is 663881188403.

663881188366 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 663881188298 and 663881188307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1464606 + ... + 1863553.

It is an arithmetic number, because the mean of its divisors is an integer number (67904448480).

Almost surely, 2^663881188366 is an apocalyptic number.

663881188366 is a deficient number, since it is larger than the sum of its proper divisors (422589987314).

663881188366 is a wasteful number, since it uses less digits than its factorization.

663881188366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3337239.

The product of its digits is 47775744, while the sum is 64.

The spelling of 663881188366 in words is "six hundred sixty-three billion, eight hundred eighty-one million, one hundred eighty-eight thousand, three hundred sixty-six".