166842671 has 2 divisors, whose sum is σ = 166842672. Its totient is φ = 166842670.

The previous prime is 166842661. The next prime is 166842719. The reversal of 166842671 is 176248661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166842671 - 2²⁶ = 99733807 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166842661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83421335 + 83421336.

It is an arithmetic number, because the mean of its divisors is an integer number (83421336).

Almost surely, 2^166842671 is an apocalyptic number.

166842671 is a deficient number, since it is larger than the sum of its proper divisors (1).

166842671 is an equidigital number, since it uses as much as digits as its factorization.

166842671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 166842671 is about 12916.7593071947. The cubic root of 166842671 is about 550.5148578334.

The spelling of 166842671 in words is "one hundred sixty-six million, eight hundred forty-two thousand, six hundred seventy-one".