66187249 has 2 divisors, whose sum is σ = 66187250. Its totient is φ = 66187248.

The previous prime is 66187237. The next prime is 66187259. The reversal of 66187249 is 94278166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38044224 + 28143025 = 6168^2 + 5305^2 .

It is a cyclic number.

It is not a de Polignac number, because 66187249 - 2⁵ = 66187217 is a prime.

It is not a weakly prime, because it can be changed into another prime (66187259) 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, 33093624 + 33093625.

It is an arithmetic number, because the mean of its divisors is an integer number (33093625).

Almost surely, 2^66187249 is an apocalyptic number.

It is an amenable number.

66187249 is a deficient number, since it is larger than the sum of its proper divisors (1).

66187249 is an equidigital number, since it uses as much as digits as its factorization.

66187249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 66187249 is about 8135.5546215363. The cubic root of 66187249 is about 404.5058220867.

The spelling of 66187249 in words is "sixty-six million, one hundred eighty-seven thousand, two hundred forty-nine".