66131171 has 2 divisors, whose sum is σ = 66131172. Its totient is φ = 66131170.

The previous prime is 66131161. The next prime is 66131201. The reversal of 66131171 is 17113166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66131171 - 2¹⁰ = 66130147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66131171.

It is not a weakly prime, because it can be changed into another prime (66131111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33065585 + 33065586.

It is an arithmetic number, because the mean of its divisors is an integer number (33065586).

Almost surely, 2^66131171 is an apocalyptic number.

66131171 is a deficient number, since it is larger than the sum of its proper divisors (1).

66131171 is an equidigital number, since it uses as much as digits as its factorization.

66131171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 26.

The square root of 66131171 is about 8132.1074144406. The cubic root of 66131171 is about 404.3915488833.

The spelling of 66131171 in words is "sixty-six million, one hundred thirty-one thousand, one hundred seventy-one".