216690886686647 has 2 divisors, whose sum is σ = 216690886686648. Its totient is φ = 216690886686646.

The previous prime is 216690886686611. The next prime is 216690886686697. The reversal of 216690886686647 is 746686688096612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216690886686647 - 2¹² = 216690886682551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216690886686697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108345443343323 + 108345443343324.

It is an arithmetic number, because the mean of its divisors is an integer number (108345443343324).

Almost surely, 2^{216690886686647} is an apocalyptic number.

216690886686647 is a deficient number, since it is larger than the sum of its proper divisors (1).

216690886686647 is an equidigital number, since it uses as much as digits as its factorization.

216690886686647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12039487488, while the sum is 83.

The spelling of 216690886686647 in words is "two hundred sixteen trillion, six hundred ninety billion, eight hundred eighty-six million, six hundred eighty-six thousand, six hundred forty-seven".