666877171 has 2 divisors, whose sum is σ = 666877172. Its totient is φ = 666877170.

The previous prime is 666877117. The next prime is 666877187. The reversal of 666877171 is 171778666.

Together with previous prime (666877117) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666877171 - 2²³ = 658488563 is a prime.

It is a super-2 number, since 2×666877171² = 889450322401926482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (666827171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333438585 + 333438586.

It is an arithmetic number, because the mean of its divisors is an integer number (333438586).

Almost surely, 2^666877171 is an apocalyptic number.

666877171 is a deficient number, since it is larger than the sum of its proper divisors (1).

666877171 is an equidigital number, since it uses as much as digits as its factorization.

666877171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 49.

The square root of 666877171 is about 25823.9650518661. The cubic root of 666877171 is about 873.6724012971.

The spelling of 666877171 in words is "six hundred sixty-six million, eight hundred seventy-seven thousand, one hundred seventy-one".