216688087211129 has 4 divisors (see below), whose sum is σ = 216693190479780. Its totient is φ = 216682983942480.

The previous prime is 216688087211083. The next prime is 216688087211159. The reversal of 216688087211129 is 921112780886612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 160550186305600 + 56137900905529 = 12670840^2 + 7492523^2 .

It is a cyclic number.

It is not a de Polignac number, because 216688087211129 - 2³² = 216683792243833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216688087211159) 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 3 ways as a sum of consecutive naturals, for example, 2551570634 + ... + 2551655555.

It is an arithmetic number, because the mean of its divisors is an integer number (54173297619945).

Almost surely, 2^{216688087211129} is an apocalyptic number.

It is an amenable number.

216688087211129 is a deficient number, since it is larger than the sum of its proper divisors (5103268651).

216688087211129 is an equidigital number, since it uses as much as digits as its factorization.

216688087211129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5103268650.

The product of its (nonzero) digits is 9289728, while the sum is 62.

The spelling of 216688087211129 in words is "two hundred sixteen trillion, six hundred eighty-eight billion, eighty-seven million, two hundred eleven thousand, one hundred twenty-nine".