66682249 has 4 divisors (see below), whose sum is σ = 66738436. Its totient is φ = 66626064.

The previous prime is 66682247. The next prime is 66682289. The reversal of 66682249 is 94228666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12924025 + 53758224 = 3595^2 + 7332^2 .

It is a cyclic number.

It is not a de Polignac number, because 66682249 - 2¹ = 66682247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66682247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26274 + ... + 28699.

It is an arithmetic number, because the mean of its divisors is an integer number (16684609).

Almost surely, 2^66682249 is an apocalyptic number.

It is an amenable number.

66682249 is a deficient number, since it is larger than the sum of its proper divisors (56187).

66682249 is a wasteful number, since it uses less digits than its factorization.

66682249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56186.

The product of its digits is 248832, while the sum is 43.

The square root of 66682249 is about 8165.9199726669. The cubic root of 66682249 is about 405.5117222102.

The spelling of 66682249 in words is "sixty-six million, six hundred eighty-two thousand, two hundred forty-nine".