666151271 has 2 divisors, whose sum is σ = 666151272. Its totient is φ = 666151270.

The previous prime is 666151261. The next prime is 666151279. The reversal of 666151271 is 172151666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666151271 - 2¹⁸ = 665889127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666151279) 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 as a sum of consecutive naturals, namely, 333075635 + 333075636.

It is an arithmetic number, because the mean of its divisors is an integer number (333075636).

Almost surely, 2^666151271 is an apocalyptic number.

666151271 is a deficient number, since it is larger than the sum of its proper divisors (1).

666151271 is an equidigital number, since it uses as much as digits as its factorization.

666151271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 666151271 is about 25809.9064508185. The cubic root of 666151271 is about 873.3552869055.

The spelling of 666151271 in words is "six hundred sixty-six million, one hundred fifty-one thousand, two hundred seventy-one".