166917811 has 2 divisors, whose sum is σ = 166917812. Its totient is φ = 166917810.

The previous prime is 166917797. The next prime is 166917827. The reversal of 166917811 is 118719661.

It is a weak prime.

It is an emirp because it is prime and its reverse (118719661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166917811 - 2¹³ = 166909619 is a prime.

It is not a weakly prime, because it can be changed into another prime (166917851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83458905 + 83458906.

It is an arithmetic number, because the mean of its divisors is an integer number (83458906).

Almost surely, 2^166917811 is an apocalyptic number.

166917811 is a deficient number, since it is larger than the sum of its proper divisors (1).

166917811 is an equidigital number, since it uses as much as digits as its factorization.

166917811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 40.

The square root of 166917811 is about 12919.6676040833. The cubic root of 166917811 is about 550.5974895284.

The spelling of 166917811 in words is "one hundred sixty-six million, nine hundred seventeen thousand, eight hundred eleven".