2655555561 has 24 divisors (see below), whose sum is σ = 3893834880. Its totient is φ = 1743638400.

The previous prime is 2655555547. The next prime is 2655555563. The reversal of 2655555561 is 1655555562.

It is not a de Polignac number, because 2655555561 - 2¹¹ = 2655553513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2655555563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 950076 + ... + 952866.

It is an arithmetic number, because the mean of its divisors is an integer number (162243120).

Almost surely, 2^2655555561 is an apocalyptic number.

It is an amenable number.

2655555561 is a deficient number, since it is larger than the sum of its proper divisors (1238279319).

2655555561 is a wasteful number, since it uses less digits than its factorization.

2655555561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4357 (or 4354 counting only the distinct ones).

The product of its digits is 1125000, while the sum is 45.

The square root of 2655555561 is about 51532.0828319601. The cubic root of 2655555561 is about 1384.7938648935.

Subtracting from 2655555561 its reverse (1655555562), we obtain a palindrome (999999999).

The spelling of 2655555561 in words is "two billion, six hundred fifty-five million, five hundred fifty-five thousand, five hundred sixty-one".