216643376657 has 8 divisors (see below), whose sum is σ = 217051348800. Its totient is φ = 216235505520.

The previous prime is 216643376647. The next prime is 216643376659. The reversal of 216643376657 is 756673346612.

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 216643376657 - 2⁴ = 216643376641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216643376659) 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, 5317988 + ... + 5358570.

It is an arithmetic number, because the mean of its divisors is an integer number (27131418600).

Almost surely, 2^216643376657 is an apocalyptic number.

It is an amenable number.

216643376657 is a deficient number, since it is larger than the sum of its proper divisors (407972143).

216643376657 is an equidigital number, since it uses as much as digits as its factorization.

216643376657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50503.

The product of its digits is 22861440, while the sum is 56.

The spelling of 216643376657 in words is "two hundred sixteen billion, six hundred forty-three million, three hundred seventy-six thousand, six hundred fifty-seven".