66040171 has 2 divisors, whose sum is σ = 66040172. Its totient is φ = 66040170.

The previous prime is 66040111. The next prime is 66040187. The reversal of 66040171 is 17104066.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66040171 - 2⁷ = 66040043 is a prime.

It is a super-2 number, since 2×66040171² = 8722608371418482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66040111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33020085 + 33020086.

It is an arithmetic number, because the mean of its divisors is an integer number (33020086).

Almost surely, 2^66040171 is an apocalyptic number.

66040171 is a deficient number, since it is larger than the sum of its proper divisors (1).

66040171 is an equidigital number, since it uses as much as digits as its factorization.

66040171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 66040171 is about 8126.5103826919. The cubic root of 66040171 is about 404.2059756621.

The spelling of 66040171 in words is "sixty-six million, forty thousand, one hundred seventy-one".