66043271 has 4 divisors (see below), whose sum is σ = 75478032. Its totient is φ = 56608512.

The previous prime is 66043267. The next prime is 66043273. The reversal of 66043271 is 17234066.

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

It is a cyclic number.

It is not a de Polignac number, because 66043271 - 2² = 66043267 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66043273) 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, 4717370 + ... + 4717383.

It is an arithmetic number, because the mean of its divisors is an integer number (18869508).

Almost surely, 2^66043271 is an apocalyptic number.

66043271 is a deficient number, since it is larger than the sum of its proper divisors (9434761).

66043271 is an equidigital number, since it uses as much as digits as its factorization.

66043271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9434760.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 66043271 is about 8126.7011142283. The cubic root of 66043271 is about 404.2123001910.

The spelling of 66043271 in words is "sixty-six million, forty-three thousand, two hundred seventy-one".