166657872871 has 6 divisors (see below), whose sum is σ = 193867321560. Its totient is φ = 142849605276.

The previous prime is 166657872869. The next prime is 166657872881. The reversal of 166657872871 is 178278756661.

It is not a de Polignac number, because 166657872871 - 2¹ = 166657872869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166657872881) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1700590491 + ... + 1700590588.

It is an arithmetic number, because the mean of its divisors is an integer number (32311220260).

Almost surely, 2^166657872871 is an apocalyptic number.

166657872871 is a deficient number, since it is larger than the sum of its proper divisors (27209448689).

166657872871 is an equidigital number, since it uses as much as digits as its factorization.

166657872871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3401181093 (or 3401181086 counting only the distinct ones).

The product of its digits is 47416320, while the sum is 64.

The spelling of 166657872871 in words is "one hundred sixty-six billion, six hundred fifty-seven million, eight hundred seventy-two thousand, eight hundred seventy-one".