22166181 has 24 divisors (see below), whose sum is σ = 35380800. Its totient is φ = 13301376.

The previous prime is 22166161. The next prime is 22166197. The reversal of 22166181 is 18166122.

It is not a de Polignac number, because 22166181 - 2⁹ = 22165669 is a prime.

It is a super-2 number, since 2×22166181² = 982679160249522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22166101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 370 + ... + 6668.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^22166181 is an apocalyptic number.

It is an amenable number.

22166181 is a deficient number, since it is larger than the sum of its proper divisors (13214619).

22166181 is a wasteful number, since it uses less digits than its factorization.

22166181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6345 (or 6342 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 22166181 is about 4708.0973864184. The cubic root of 22166181 is about 280.9076878338.

The spelling of 22166181 in words is "twenty-two million, one hundred sixty-six thousand, one hundred eighty-one".