2161696161 has 8 divisors (see below), whose sum is σ = 2883147904. Its totient is φ = 1440687600.

The previous prime is 2161696157. The next prime is 2161696181. The reversal of 2161696161 is 1616961612.

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

It is not a de Polignac number, because 2161696161 - 2² = 2161696157 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2161696181) 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, 99241 + ... + 119046.

It is an arithmetic number, because the mean of its divisors is an integer number (360393488).

Almost surely, 2^2161696161 is an apocalyptic number.

It is an amenable number.

2161696161 is a deficient number, since it is larger than the sum of its proper divisors (721451743).

2161696161 is a wasteful number, since it uses less digits than its factorization.

2161696161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221591.

The product of its digits is 23328, while the sum is 39.

The square root of 2161696161 is about 46494.0443605415. The cubic root of 2161696161 is about 1292.9990836487. Note that the first 3 decimals are identical.

The spelling of 2161696161 in words is "two billion, one hundred sixty-one million, six hundred ninety-six thousand, one hundred sixty-one".