1205566161 has 16 divisors (see below), whose sum is σ = 1671403008. Its totient is φ = 772099200.

The previous prime is 1205566139. The next prime is 1205566177. The reversal of 1205566161 is 1616655021.

It is not a de Polignac number, because 1205566161 - 2⁵ = 1205566129 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1205566181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34570 + ... + 60051.

It is an arithmetic number, because the mean of its divisors is an integer number (104462688).

Almost surely, 2^1205566161 is an apocalyptic number.

It is an amenable number.

1205566161 is a deficient number, since it is larger than the sum of its proper divisors (465836847).

1205566161 is a wasteful number, since it uses less digits than its factorization.

1205566161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94792.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 1205566161 is about 34721.2638162841. The cubic root of 1205566161 is about 1064.2990710651.

The spelling of 1205566161 in words is "one billion, two hundred five million, five hundred sixty-six thousand, one hundred sixty-one".