1666710271 has 2 divisors, whose sum is σ = 1666710272. Its totient is φ = 1666710270.

The previous prime is 1666710263. The next prime is 1666710307. The reversal of 1666710271 is 1720176661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1666710271 - 2³ = 1666710263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1666710271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666710211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833355135 + 833355136.

It is an arithmetic number, because the mean of its divisors is an integer number (833355136).

Almost surely, 2^1666710271 is an apocalyptic number.

1666710271 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666710271 is an equidigital number, since it uses as much as digits as its factorization.

1666710271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 1666710271 is about 40825.3630847296. The cubic root of 1666710271 is about 1185.6414411373.

The spelling of 1666710271 in words is "one billion, six hundred sixty-six million, seven hundred ten thousand, two hundred seventy-one".