6665166671 has 2 divisors, whose sum is σ = 6665166672. Its totient is φ = 6665166670.

The previous prime is 6665166667. The next prime is 6665166707. The reversal of 6665166671 is 1766615666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6665166671 - 2² = 6665166667 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6665166071) 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 as a sum of consecutive naturals, namely, 3332583335 + 3332583336.

It is an arithmetic number, because the mean of its divisors is an integer number (3332583336).

Almost surely, 2^6665166671 is an apocalyptic number.

6665166671 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665166671 is an equidigital number, since it uses as much as digits as its factorization.

6665166671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 50.

The square root of 6665166671 is about 81640.4720160289. The cubic root of 6665166671 is about 1881.9308921776.

The spelling of 6665166671 in words is "six billion, six hundred sixty-five million, one hundred sixty-six thousand, six hundred seventy-one".