166263109 has 2 divisors, whose sum is σ = 166263110. Its totient is φ = 166263108.

The previous prime is 166263103. The next prime is 166263151. The reversal of 166263109 is 901362661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135070884 + 31192225 = 11622^2 + 5585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166263109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166263103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83131554 + 83131555.

It is an arithmetic number, because the mean of its divisors is an integer number (83131555).

Almost surely, 2^166263109 is an apocalyptic number.

It is an amenable number.

166263109 is a deficient number, since it is larger than the sum of its proper divisors (1).

166263109 is an equidigital number, since it uses as much as digits as its factorization.

166263109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 166263109 is about 12894.3052934231. The cubic root of 166263109 is about 549.8766764821.

The spelling of 166263109 in words is "one hundred sixty-six million, two hundred sixty-three thousand, one hundred nine".