161605162 has 16 divisors (see below), whose sum is σ = 261512712. Its totient is φ = 74613760.

The previous prime is 161605141. The next prime is 161605163. The reversal of 161605162 is 261506161.

It can be written as a sum of positive squares in 4 ways, for example, as 161010721 + 594441 = 12689^2 + 771^2 .

It is a super-2 number, since 2×161605162² = 52232456770092488, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161605162.

It is not an unprimeable number, because it can be changed into a prime (161605163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43039 + ... + 46642.

Almost surely, 2^161605162 is an apocalyptic number.

161605162 is a deficient number, since it is larger than the sum of its proper divisors (99907550).

161605162 is a wasteful number, since it uses less digits than its factorization.

161605162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89753.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 161605162 is about 12712.4018973599. The cubic root of 161605162 is about 544.6929359117.

Subtracting 161605162 from its reverse (261506161), we obtain a palindrome (99900999).

The spelling of 161605162 in words is "one hundred sixty-one million, six hundred five thousand, one hundred sixty-two".