216696569642817 has 16 divisors (see below), whose sum is σ = 315196471279872. Its totient is φ = 131330645624720.

The previous prime is 216696569642809. The next prime is 216696569642827. The reversal of 216696569642817 is 718246965696612.

It is a cyclic number.

It is not a de Polignac number, because 216696569642817 - 2³ = 216696569642809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216696569642827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7937823 + ... + 22280084.

It is an arithmetic number, because the mean of its divisors is an integer number (19699779454992).

Almost surely, 2^{216696569642817} is an apocalyptic number.

It is an amenable number.

216696569642817 is a deficient number, since it is larger than the sum of its proper divisors (98499901637055).

216696569642817 is a wasteful number, since it uses less digits than its factorization.

216696569642817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30435228.

The product of its digits is 2821754880, while the sum is 78.

The spelling of 216696569642817 in words is "two hundred sixteen trillion, six hundred ninety-six billion, five hundred sixty-nine million, six hundred forty-two thousand, eight hundred seventeen".