166026109 has 2 divisors, whose sum is σ = 166026110. Its totient is φ = 166026108.

The previous prime is 166026103. The next prime is 166026191. The reversal of 166026109 is 901620661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135256900 + 30769209 = 11630^2 + 5547^2 .

It is a cyclic number.

It is not a de Polignac number, because 166026109 - 2³ = 166026101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166026101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83013054 + 83013055.

It is an arithmetic number, because the mean of its divisors is an integer number (83013055).

Almost surely, 2^166026109 is an apocalyptic number.

It is an amenable number.

166026109 is a deficient number, since it is larger than the sum of its proper divisors (1).

166026109 is an equidigital number, since it uses as much as digits as its factorization.

166026109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 166026109 is about 12885.1119125912. Note that the first 3 decimals coincide. The cubic root of 166026109 is about 549.6152780593.

The spelling of 166026109 in words is "one hundred sixty-six million, twenty-six thousand, one hundred nine".