166862209 has 2 divisors, whose sum is σ = 166862210. Its totient is φ = 166862208.

The previous prime is 166862183. The next prime is 166862219. The reversal of 166862209 is 902268661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101203600 + 65658609 = 10060^2 + 8103^2 .

It is a cyclic number.

It is not a de Polignac number, because 166862209 - 2¹⁵ = 166829441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166862219) 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, 83431104 + 83431105.

It is an arithmetic number, because the mean of its divisors is an integer number (83431105).

Almost surely, 2^166862209 is an apocalyptic number.

It is an amenable number.

166862209 is a deficient number, since it is larger than the sum of its proper divisors (1).

166862209 is an equidigital number, since it uses as much as digits as its factorization.

166862209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 166862209 is about 12917.5155893074. The cubic root of 166862209 is about 550.5363462201.

The spelling of 166862209 in words is "one hundred sixty-six million, eight hundred sixty-two thousand, two hundred nine".