2155775511 has 16 divisors (see below), whose sum is σ = 3107427200. Its totient is φ = 1324742688.

The previous prime is 2155775471. The next prime is 2155775551. The reversal of 2155775511 is 1155775512.

It is an interprime number because it is at equal distance from previous prime (2155775471) and next prime (2155775551).

It is not a de Polignac number, because 2155775511 - 2⁷ = 2155775383 is a prime.

It is a super-2 number, since 2×2155775511² = 9294736107654622242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2155775511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155775551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 508981 + ... + 513198.

It is an arithmetic number, because the mean of its divisors is an integer number (194214200).

Almost surely, 2^2155775511 is an apocalyptic number.

2155775511 is a deficient number, since it is larger than the sum of its proper divisors (951651689).

2155775511 is a wasteful number, since it uses less digits than its factorization.

2155775511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022238.

The product of its digits is 61250, while the sum is 39.

The square root of 2155775511 is about 46430.3296456099. The cubic root of 2155775511 is about 1291.8175431352.

Subtracting from 2155775511 its reverse (1155775512), we obtain a palindrome (999999999).

The spelling of 2155775511 in words is "two billion, one hundred fifty-five million, seven hundred seventy-five thousand, five hundred eleven".