216656713251229 has 2 divisors, whose sum is σ = 216656713251230. Its totient is φ = 216656713251228.

The previous prime is 216656713251211. The next prime is 216656713251233. The reversal of 216656713251229 is 922152317656612.

216656713251229 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175406794039129 + 41249919212100 = 13244123^2 + 6422610^2 .

It is a cyclic number.

It is not a de Polignac number, because 216656713251229 - 2⁹ = 216656713250717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216656713251029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108328356625614 + 108328356625615.

It is an arithmetic number, because the mean of its divisors is an integer number (108328356625615).

Almost surely, 2^{216656713251229} is an apocalyptic number.

It is an amenable number.

216656713251229 is a deficient number, since it is larger than the sum of its proper divisors (1).

216656713251229 is an equidigital number, since it uses as much as digits as its factorization.

216656713251229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16329600, while the sum is 58.

The spelling of 216656713251229 in words is "two hundred sixteen trillion, six hundred fifty-six billion, seven hundred thirteen million, two hundred fifty-one thousand, two hundred twenty-nine".