166871717811 has 32 divisors (see below), whose sum is σ = 248407568640. Its totient is φ = 110712960000.

The previous prime is 166871717797. The next prime is 166871717849. The reversal of 166871717811 is 118717178661.

It is not a de Polignac number, because 166871717811 - 2²³ = 166863329203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166871717861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8739571 + ... + 8758643.

It is an arithmetic number, because the mean of its divisors is an integer number (7762736520).

Almost surely, 2^166871717811 is an apocalyptic number.

166871717811 is a deficient number, since it is larger than the sum of its proper divisors (81535850829).

166871717811 is a wasteful number, since it uses less digits than its factorization.

166871717811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20624 (or 20618 counting only the distinct ones).

The product of its digits is 790272, while the sum is 54.

The spelling of 166871717811 in words is "one hundred sixty-six billion, eight hundred seventy-one million, seven hundred seventeen thousand, eight hundred eleven".