2156555611 has 12 divisors (see below), whose sum is σ = 2524633968. Its totient is φ = 1836695952.

The previous prime is 2156555603. The next prime is 2156555617. The reversal of 2156555611 is 1165556512.

It is not a de Polignac number, because 2156555611 - 2³ = 2156555603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2156555617) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132471 + ... + 147856.

It is an arithmetic number, because the mean of its divisors is an integer number (210386164).

Almost surely, 2^2156555611 is an apocalyptic number.

2156555611 is a deficient number, since it is larger than the sum of its proper divisors (368078357).

2156555611 is a wasteful number, since it uses less digits than its factorization.

2156555611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280498 (or 280491 counting only the distinct ones).

The product of its digits is 45000, while the sum is 37.

The square root of 2156555611 is about 46438.7296445542. The cubic root of 2156555611 is about 1291.9733455875.

Subtracting from 2156555611 its reverse (1165556512), we obtain a palindrome (990999099).

The spelling of 2156555611 in words is "two billion, one hundred fifty-six million, five hundred fifty-five thousand, six hundred eleven".