166397069 has 2 divisors, whose sum is σ = 166397070. Its totient is φ = 166397068.

The previous prime is 166397059. The next prime is 166397093. The reversal of 166397069 is 960793661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141015625 + 25381444 = 11875^2 + 5038^2 .

It is a cyclic number.

It is not a de Polignac number, because 166397069 - 2⁴ = 166397053 is a prime.

It is a super-2 number, since 2×166397069² = 55375969143581522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166397059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83198534 + 83198535.

It is an arithmetic number, because the mean of its divisors is an integer number (83198535).

Almost surely, 2^166397069 is an apocalyptic number.

It is an amenable number.

166397069 is a deficient number, since it is larger than the sum of its proper divisors (1).

166397069 is an equidigital number, since it uses as much as digits as its factorization.

166397069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 47.

The square root of 166397069 is about 12899.4987887127. The cubic root of 166397069 is about 550.0243173821.

The spelling of 166397069 in words is "one hundred sixty-six million, three hundred ninety-seven thousand, sixty-nine".