2161511116 has 12 divisors (see below), whose sum is σ = 3785301520. Its totient is φ = 1079996400.

The previous prime is 2161511101. The next prime is 2161511119. The reversal of 2161511116 is 6111151612.

It is not an unprimeable number, because it can be changed into a prime (2161511119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183360 + ... + 194791.

Almost surely, 2^2161511116 is an apocalyptic number.

It is an amenable number.

2161511116 is a deficient number, since it is larger than the sum of its proper divisors (1623790404).

2161511116 is a wasteful number, since it uses less digits than its factorization.

2161511116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379584 (or 379582 counting only the distinct ones).

The product of its digits is 360, while the sum is 25.

The square root of 2161511116 is about 46492.0543318963. The cubic root of 2161511116 is about 1292.9621882626.

Adding to 2161511116 its reverse (6111151612), we get a palindrome (8272662728).

The spelling of 2161511116 in words is "two billion, one hundred sixty-one million, five hundred eleven thousand, one hundred sixteen".