166424161 has 4 divisors (see below), whose sum is σ = 168139972. Its totient is φ = 164708352.

The previous prime is 166424149. The next prime is 166424171. The reversal of 166424161 is 161424661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161424661 = 3413 ⋅47297.

It can be written as a sum of positive squares in 2 ways, for example, as 73205136 + 93219025 = 8556^2 + 9655^2 .

It is a cyclic number.

It is not a de Polignac number, because 166424161 - 2¹³ = 166415969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166424131) 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, 857760 + ... + 857953.

It is an arithmetic number, because the mean of its divisors is an integer number (42034993).

Almost surely, 2^166424161 is an apocalyptic number.

It is an amenable number.

166424161 is a deficient number, since it is larger than the sum of its proper divisors (1715811).

166424161 is an equidigital number, since it uses as much as digits as its factorization.

166424161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715810.

The product of its digits is 6912, while the sum is 31.

The square root of 166424161 is about 12900.5488642926. The cubic root of 166424161 is about 550.0541665661.

The spelling of 166424161 in words is "one hundred sixty-six million, four hundred twenty-four thousand, one hundred sixty-one".