22166606064181 has 2 divisors, whose sum is σ = 22166606064182. Its totient is φ = 22166606064180.

The previous prime is 22166606064137. The next prime is 22166606064191. The reversal of 22166606064181 is 18146060666122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22157345851281 + 9260212900 = 4707159^2 + 96230^2 .

It is a cyclic number.

It is not a de Polignac number, because 22166606064181 - 2⁹ = 22166606063669 is a prime.

It is a super-2 number, since 2×22166606064181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22166606064191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11083303032090 + 11083303032091.

It is an arithmetic number, because the mean of its divisors is an integer number (11083303032091).

Almost surely, 2^{22166606064181} is an apocalyptic number.

It is an amenable number.

22166606064181 is a deficient number, since it is larger than the sum of its proper divisors (1).

22166606064181 is an equidigital number, since it uses as much as digits as its factorization.

22166606064181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 49.

The spelling of 22166606064181 in words is "twenty-two trillion, one hundred sixty-six billion, six hundred six million, sixty-four thousand, one hundred eighty-one".