2156116511 has 4 divisors (see below), whose sum is σ = 2282946912. Its totient is φ = 2029286112.

The previous prime is 2156116483. The next prime is 2156116513. The reversal of 2156116511 is 1156116512.

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

It is a cyclic number.

It is not a de Polignac number, because 2156116511 - 2¹⁰ = 2156115487 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 (2156116513) 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, 63415175 + ... + 63415208.

It is an arithmetic number, because the mean of its divisors is an integer number (570736728).

Almost surely, 2^2156116511 is an apocalyptic number.

2156116511 is a deficient number, since it is larger than the sum of its proper divisors (126830401).

2156116511 is a wasteful number, since it uses less digits than its factorization.

2156116511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126830400.

The product of its digits is 1800, while the sum is 29.

The square root of 2156116511 is about 46434.0016690356. The cubic root of 2156116511 is about 1291.8856526632.

Subtracting from 2156116511 its reverse (1156116512), we obtain a palindrome (999999999).

The spelling of 2156116511 in words is "two billion, one hundred fifty-six million, one hundred sixteen thousand, five hundred eleven".