161001566 has 32 divisors (see below), whose sum is σ = 268040448. Its totient is φ = 71922240.

The previous prime is 161001563. The next prime is 161001571. The reversal of 161001566 is 665100161.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161001563) 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 15 ways as a sum of consecutive naturals, for example, 514226 + ... + 514538.

It is an arithmetic number, because the mean of its divisors is an integer number (8376264).

Almost surely, 2^161001566 is an apocalyptic number.

161001566 is a deficient number, since it is larger than the sum of its proper divisors (107038882).

161001566 is a wasteful number, since it uses less digits than its factorization.

161001566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 161001566 is about 12688.6392493443. The cubic root of 161001566 is about 544.0139463517.

The spelling of 161001566 in words is "one hundred sixty-one million, one thousand, five hundred sixty-six".