66252249 has 28 divisors (see below), whose sum is σ = 113532096. Its totient is φ = 37855512.

The previous prime is 66252233. The next prime is 66252289. The reversal of 66252249 is 94225266.

66252249 is a `hidden beast` number, since 6 + 625 + 2 + 24 + 9 = 666.

It is not a de Polignac number, because 66252249 - 2⁴ = 66252233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66252209) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1389 + ... + 11594.

Almost surely, 2^66252249 is an apocalyptic number.

It is an amenable number.

66252249 is a deficient number, since it is larger than the sum of its proper divisors (47279847).

66252249 is an equidigital number, since it uses as much as digits as its factorization.

66252249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13008 (or 12993 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 66252249 is about 8139.5484518492. The cubic root of 66252249 is about 404.6381953985.

The spelling of 66252249 in words is "sixty-six million, two hundred fifty-two thousand, two hundred forty-nine".