166129174989 has 20 divisors (see below), whose sum is σ = 256725804060. Its totient is φ = 106933720320.

The previous prime is 166129174951. The next prime is 166129175033. The reversal of 166129174989 is 989471921661.

166129174989 is a `hidden beast` number, since 1 + 6 + 6 + 129 + 17 + 498 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 115968853764 + 50160321225 = 340542^2 + 223965^2 .

It is not a de Polignac number, because 166129174989 - 2²⁰ = 166128126413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166129174909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 35359332 + ... + 35364029.

It is an arithmetic number, because the mean of its divisors is an integer number (12836290203).

Almost surely, 2^166129174989 is an apocalyptic number.

It is an amenable number.

166129174989 is a deficient number, since it is larger than the sum of its proper divisors (90596629071).

166129174989 is an equidigital number, since it uses as much as digits as its factorization.

166129174989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70723402 (or 70723393 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 63.

The spelling of 166129174989 in words is "one hundred sixty-six billion, one hundred twenty-nine million, one hundred seventy-four thousand, nine hundred eighty-nine".