166266161 has 2 divisors, whose sum is σ = 166266162. Its totient is φ = 166266160.

The previous prime is 166266157. The next prime is 166266173. The reversal of 166266161 is 161662661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94965025 + 71301136 = 9745^2 + 8444^2 .

It is a cyclic number.

It is not a de Polignac number, because 166266161 - 2² = 166266157 is a prime.

It is not a weakly prime, because it can be changed into another prime (166266761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83133080 + 83133081.

It is an arithmetic number, because the mean of its divisors is an integer number (83133081).

Almost surely, 2^166266161 is an apocalyptic number.

It is an amenable number.

166266161 is a deficient number, since it is larger than the sum of its proper divisors (1).

166266161 is an equidigital number, since it uses as much as digits as its factorization.

166266161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 35.

The square root of 166266161 is about 12894.4236396979. The cubic root of 166266161 is about 549.8800410556.

The spelling of 166266161 in words is "one hundred sixty-six million, two hundred sixty-six thousand, one hundred sixty-one".