166010905 has 4 divisors (see below), whose sum is σ = 199213092. Its totient is φ = 132808720.

The previous prime is 166010903. The next prime is 166010939. The reversal of 166010905 is 509010661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509010661 = 18233 ⋅27917.

It can be written as a sum of positive squares in 2 ways, for example, as 128323584 + 37687321 = 11328^2 + 6139^2 .

It is not a de Polignac number, because 166010905 - 2¹ = 166010903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166010903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16601086 + ... + 16601095.

It is an arithmetic number, because the mean of its divisors is an integer number (49803273).

Almost surely, 2^166010905 is an apocalyptic number.

It is an amenable number.

166010905 is a deficient number, since it is larger than the sum of its proper divisors (33202187).

166010905 is an equidigital number, since it uses as much as digits as its factorization.

166010905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33202186.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 166010905 is about 12884.5219158493. The cubic root of 166010905 is about 549.5985003653.

The spelling of 166010905 in words is "one hundred sixty-six million, ten thousand, nine hundred five".