2164667161 has 4 divisors (see below), whose sum is σ = 2173957812. Its totient is φ = 2155376512.

The previous prime is 2164667123. The next prime is 2164667177. The reversal of 2164667161 is 1617664612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 180499225 + 1984167936 = 13435^2 + 44544^2 .

It is a cyclic number.

It is not a de Polignac number, because 2164667161 - 2⁷ = 2164667033 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2164667111) 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, 4644976 + ... + 4645441.

It is an arithmetic number, because the mean of its divisors is an integer number (543489453).

Almost surely, 2^2164667161 is an apocalyptic number.

It is an amenable number.

2164667161 is a deficient number, since it is larger than the sum of its proper divisors (9290651).

2164667161 is an equidigital number, since it uses as much as digits as its factorization.

2164667161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9290650.

The product of its digits is 72576, while the sum is 40.

The square root of 2164667161 is about 46525.9837187780. The cubic root of 2164667161 is about 1293.5911714408.

The spelling of 2164667161 in words is "two billion, one hundred sixty-four million, six hundred sixty-seven thousand, one hundred sixty-one".