166426129 has 4 divisors (see below), whose sum is σ = 166451940. Its totient is φ = 166400320.

The previous prime is 166426081. The next prime is 166426133. The reversal of 166426129 is 921624661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 921624661 = 61 ⋅15108601.

It can be written as a sum of positive squares in 2 ways, for example, as 165379600 + 1046529 = 12860^2 + 1023^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166426129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166426159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5949 + ... + 19189.

It is an arithmetic number, because the mean of its divisors is an integer number (41612985).

Almost surely, 2^166426129 is an apocalyptic number.

It is an amenable number.

166426129 is a deficient number, since it is larger than the sum of its proper divisors (25811).

166426129 is a wasteful number, since it uses less digits than its factorization.

166426129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25810.

The product of its digits is 31104, while the sum is 37.

The square root of 166426129 is about 12900.6251398915. The cubic root of 166426129 is about 550.0563347255.

The spelling of 166426129 in words is "one hundred sixty-six million, four hundred twenty-six thousand, one hundred twenty-nine".