66055271 has 4 divisors (see below), whose sum is σ = 66139992. Its totient is φ = 65970552.

The previous prime is 66055259. The next prime is 66055303. The reversal of 66055271 is 17255066.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17255066 = 2 ⋅8627533.

It is a cyclic number.

It is not a de Polignac number, because 66055271 - 2¹⁸ = 65793127 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 (66055201) 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 3 ways as a sum of consecutive naturals, for example, 41180 + ... + 42753.

It is an arithmetic number, because the mean of its divisors is an integer number (16534998).

Almost surely, 2^66055271 is an apocalyptic number.

66055271 is a deficient number, since it is larger than the sum of its proper divisors (84721).

66055271 is an equidigital number, since it uses as much as digits as its factorization.

66055271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84720.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 66055271 is about 8127.4393876546. The cubic root of 66055271 is about 404.2367803729.

The spelling of 66055271 in words is "sixty-six million, fifty-five thousand, two hundred seventy-one".