66727271 has 16 divisors (see below), whose sum is σ = 74511360. Its totient is φ = 59361120.

The previous prime is 66727267. The next prime is 66727303. The reversal of 66727271 is 17272766.

It is not a de Polignac number, because 66727271 - 2² = 66727267 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66727201) 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 15 ways as a sum of consecutive naturals, for example, 43406 + ... + 44916.

It is an arithmetic number, because the mean of its divisors is an integer number (4656960).

Almost surely, 2^66727271 is an apocalyptic number.

66727271 is a deficient number, since it is larger than the sum of its proper divisors (7784089).

66727271 is a wasteful number, since it uses less digits than its factorization.

66727271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646.

The product of its digits is 49392, while the sum is 38.

The square root of 66727271 is about 8168.6762085420. The cubic root of 66727271 is about 405.6029650907.

The spelling of 66727271 in words is "sixty-six million, seven hundred twenty-seven thousand, two hundred seventy-one".