66281271 has 12 divisors (see below), whose sum is σ = 102803832. Its totient is φ = 37874928.

The previous prime is 66281261. The next prime is 66281279. The reversal of 66281271 is 17218266.

It is not a de Polignac number, because 66281271 - 2¹⁵ = 66248503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66281279) 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 in 11 ways as a sum of consecutive naturals, for example, 225300 + ... + 225593.

It is an arithmetic number, because the mean of its divisors is an integer number (8566986).

Almost surely, 2^66281271 is an apocalyptic number.

66281271 is a deficient number, since it is larger than the sum of its proper divisors (36522561).

66281271 is a wasteful number, since it uses less digits than its factorization.

66281271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450910 (or 450903 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 66281271 is about 8141.3310336824. The cubic root of 66281271 is about 404.6972711057.

The spelling of 66281271 in words is "sixty-six million, two hundred eighty-one thousand, two hundred seventy-one".