166878671 has 2 divisors, whose sum is σ = 166878672. Its totient is φ = 166878670.

The previous prime is 166878661. The next prime is 166878689. The reversal of 166878671 is 176878661.

It is a weak prime.

It is an emirp because it is prime and its reverse (176878661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166878671 - 2²² = 162684367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166878631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83439335 + 83439336.

It is an arithmetic number, because the mean of its divisors is an integer number (83439336).

Almost surely, 2^166878671 is an apocalyptic number.

166878671 is a deficient number, since it is larger than the sum of its proper divisors (1).

166878671 is an equidigital number, since it uses as much as digits as its factorization.

166878671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 50.

The square root of 166878671 is about 12918.1527704235. The cubic root of 166878671 is about 550.5544502421.

The spelling of 166878671 in words is "one hundred sixty-six million, eight hundred seventy-eight thousand, six hundred seventy-one".