2160161861 has 16 divisors (see below), whose sum is σ = 2606408448. Its totient is φ = 1763726400.

The previous prime is 2160161837. The next prime is 2160161869. The reversal of 2160161861 is 1681610612.

It is a cyclic number.

It is not a de Polignac number, because 2160161861 - 2¹⁸ = 2159899717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2160161869) 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 15 ways as a sum of consecutive naturals, for example, 198845 + ... + 209426.

It is an arithmetic number, because the mean of its divisors is an integer number (162900528).

Almost surely, 2^2160161861 is an apocalyptic number.

It is an amenable number.

2160161861 is a deficient number, since it is larger than the sum of its proper divisors (446246587).

2160161861 is a wasteful number, since it uses less digits than its factorization.

2160161861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408332.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 2160161861 is about 46477.5414689719. The cubic root of 2160161861 is about 1292.6931020046.

The spelling of 2160161861 in words is "two billion, one hundred sixty million, one hundred sixty-one thousand, eight hundred sixty-one".