166189013 has 2 divisors, whose sum is σ = 166189014. Its totient is φ = 166189012.

The previous prime is 166188989. The next prime is 166189027. The reversal of 166189013 is 310981661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166074769 + 114244 = 12887^2 + 338^2 .

It is a cyclic number.

It is not a de Polignac number, because 166189013 - 2¹² = 166184917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166189063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83094506 + 83094507.

It is an arithmetic number, because the mean of its divisors is an integer number (83094507).

Almost surely, 2^166189013 is an apocalyptic number.

It is an amenable number.

166189013 is a deficient number, since it is larger than the sum of its proper divisors (1).

166189013 is an equidigital number, since it uses as much as digits as its factorization.

166189013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 166189013 is about 12891.4317668752. The cubic root of 166189013 is about 549.7949792323.

The spelling of 166189013 in words is "one hundred sixty-six million, one hundred eighty-nine thousand, thirteen".