216686881063843 has 2 divisors, whose sum is σ = 216686881063844. Its totient is φ = 216686881063842.

The previous prime is 216686881063813. The next prime is 216686881063853. The reversal of 216686881063843 is 348360188686612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216686881063843 is a prime.

It is not a weakly prime, because it can be changed into another prime (216686881063813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108343440531921 + 108343440531922.

It is an arithmetic number, because the mean of its divisors is an integer number (108343440531922).

Almost surely, 2^{216686881063843} is an apocalyptic number.

216686881063843 is a deficient number, since it is larger than the sum of its proper divisors (1).

216686881063843 is an equidigital number, since it uses as much as digits as its factorization.

216686881063843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 382205952, while the sum is 70.

The spelling of 216686881063843 in words is "two hundred sixteen trillion, six hundred eighty-six billion, eight hundred eighty-one million, sixty-three thousand, eight hundred forty-three".