663656656366 has 16 divisors (see below), whose sum is σ = 1086096376368. Its totient is φ = 301630795200.

The previous prime is 663656656363. The next prime is 663656656367.

It is a happy number.

663656656366 is nontrivially palindromic in base 10.

663656656366 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 663656656298 and 663656656307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663656656361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1348695 + ... + 1773778.

It is an arithmetic number, because the mean of its divisors is an integer number (67881023523).

Almost surely, 2^663656656366 is an apocalyptic number.

663656656366 is a deficient number, since it is larger than the sum of its proper divisors (422439720002).

663656656366 is a wasteful number, since it uses less digits than its factorization.

663656656366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3132147.

The product of its digits is 377913600, while the sum is 64.

The spelling of 663656656366 in words is "six hundred sixty-three billion, six hundred fifty-six million, six hundred fifty-six thousand, three hundred sixty-six".