166065091 has 2 divisors, whose sum is σ = 166065092. Its totient is φ = 166065090.

The previous prime is 166065089. The next prime is 166065121. The reversal of 166065091 is 190560661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166065091 - 2¹ = 166065089 is a prime.

It is a super-2 number, since 2×166065091² = 55155228897676562, which contains 22 as substring.

Together with 166065089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (166095091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83032545 + 83032546.

It is an arithmetic number, because the mean of its divisors is an integer number (83032546).

Almost surely, 2^166065091 is an apocalyptic number.

166065091 is a deficient number, since it is larger than the sum of its proper divisors (1).

166065091 is an equidigital number, since it uses as much as digits as its factorization.

166065091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 166065091 is about 12886.6244998448. The cubic root of 166065091 is about 549.6582902223.

The spelling of 166065091 in words is "one hundred sixty-six million, sixty-five thousand, ninety-one".