166045249 has 2 divisors, whose sum is σ = 166045250. Its totient is φ = 166045248.

The previous prime is 166045247. The next prime is 166045267. The reversal of 166045249 is 942540661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84052224 + 81993025 = 9168^2 + 9055^2 .

It is an emirp because it is prime and its reverse (942540661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166045249 - 2¹ = 166045247 is a prime.

Together with 166045247, it forms a pair of twin primes.

It is equal to p_9294076 and since 166045249 and 9294076 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (166045247) 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, 83022624 + 83022625.

It is an arithmetic number, because the mean of its divisors is an integer number (83022625).

Almost surely, 2^166045249 is an apocalyptic number.

It is an amenable number.

166045249 is a deficient number, since it is larger than the sum of its proper divisors (1).

166045249 is an equidigital number, since it uses as much as digits as its factorization.

166045249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 166045249 is about 12885.8546088337. The cubic root of 166045249 is about 549.6363976938.

The spelling of 166045249 in words is "one hundred sixty-six million, forty-five thousand, two hundred forty-nine".