3656866686563 has 8 divisors (see below), whose sum is σ = 3658520837088. Its totient is φ = 3655212761344.

The previous prime is 3656866686521. The next prime is 3656866686589.

3656866686563 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 3656866686563 - 2²⁴ = 3656849909347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3656866676563) 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, 38130770 + ... + 38226552.

It is an arithmetic number, because the mean of its divisors is an integer number (457315104636).

Almost surely, 2^{3656866686563} is an apocalyptic number.

3656866686563 is a deficient number, since it is larger than the sum of its proper divisors (1654150525).

3656866686563 is a wasteful number, since it uses less digits than its factorization.

3656866686563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112653.

The product of its digits is 4031078400, while the sum is 74.

The spelling of 3656866686563 in words is "three trillion, six hundred fifty-six billion, eight hundred sixty-six million, six hundred eighty-six thousand, five hundred sixty-three".