2161061605 has 8 divisors (see below), whose sum is σ = 2595917952. Its totient is φ = 1727086608.

The previous prime is 2161061603. The next prime is 2161061611. The reversal of 2161061605 is 5061601612.

2161061605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2161061605 - 2¹ = 2161061603 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 (2161061603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214929 + ... + 224758.

It is an arithmetic number, because the mean of its divisors is an integer number (324489744).

Almost surely, 2^2161061605 is an apocalyptic number.

It is an amenable number.

2161061605 is a deficient number, since it is larger than the sum of its proper divisors (434856347).

2161061605 is an equidigital number, since it uses as much as digits as its factorization.

2161061605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440675.

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

The square root of 2161061605 is about 46487.2198028662. The cubic root of 2161061605 is about 1292.8725532822.

The spelling of 2161061605 in words is "two billion, one hundred sixty-one million, sixty-one thousand, six hundred five".