166054081 has 2 divisors, whose sum is σ = 166054082. Its totient is φ = 166054080.

The previous prime is 166054067. The next prime is 166054103. The reversal of 166054081 is 180450661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159163456 + 6890625 = 12616^2 + 2625^2 .

It is a cyclic number.

It is not a de Polignac number, because 166054081 - 2²⁷ = 31836353 is a prime.

It is a super-2 number, since 2×166054081² = 55147915633509122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166054981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83027040 + 83027041.

It is an arithmetic number, because the mean of its divisors is an integer number (83027041).

Almost surely, 2^166054081 is an apocalyptic number.

It is an amenable number.

166054081 is a deficient number, since it is larger than the sum of its proper divisors (1).

166054081 is an equidigital number, since it uses as much as digits as its factorization.

166054081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 166054081 is about 12886.1973056445. The cubic root of 166054081 is about 549.6461426331.

The spelling of 166054081 in words is "one hundred sixty-six million, fifty-four thousand, eighty-one".