216707441917181 has 2 divisors, whose sum is σ = 216707441917182. Its totient is φ = 216707441917180.

The previous prime is 216707441917163. The next prime is 216707441917229. The reversal of 216707441917181 is 181719144707612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182974182972025 + 33733258945156 = 13526795^2 + 5808034^2 .

It is a cyclic number.

It is not a de Polignac number, because 216707441917181 - 2²² = 216707437722877 is a prime.

It is a super-2 number, since 2×216707441917181² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216707441917181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216707441914181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108353720958590 + 108353720958591.

It is an arithmetic number, because the mean of its divisors is an integer number (108353720958591).

Almost surely, 2^{216707441917181} is an apocalyptic number.

It is an amenable number.

216707441917181 is a deficient number, since it is larger than the sum of its proper divisors (1).

216707441917181 is an equidigital number, since it uses as much as digits as its factorization.

216707441917181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4741632, while the sum is 59.

The spelling of 216707441917181 in words is "two hundred sixteen trillion, seven hundred seven billion, four hundred forty-one million, nine hundred seventeen thousand, one hundred eighty-one".