166257233 has 2 divisors, whose sum is σ = 166257234. Its totient is φ = 166257232.

The previous prime is 166257199. The next prime is 166257241. The reversal of 166257233 is 332752661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164429329 + 1827904 = 12823^2 + 1352^2 .

It is a cyclic number.

It is not a de Polignac number, because 166257233 - 2¹² = 166253137 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 166257193 and 166257202.

It is not a weakly prime, because it can be changed into another prime (166257293) 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, 83128616 + 83128617.

It is an arithmetic number, because the mean of its divisors is an integer number (83128617).

Almost surely, 2^166257233 is an apocalyptic number.

It is an amenable number.

166257233 is a deficient number, since it is larger than the sum of its proper divisors (1).

166257233 is an equidigital number, since it uses as much as digits as its factorization.

166257233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 35.

The square root of 166257233 is about 12894.0774388864. The cubic root of 166257233 is about 549.8701985700.

The spelling of 166257233 in words is "one hundred sixty-six million, two hundred fifty-seven thousand, two hundred thirty-three".