55611 has 12 divisors (see below), whose sum is σ = 82992. Its totient is φ = 35856.

The previous prime is 55609. The next prime is 55619. The reversal of 55611 is 11655.

55611 is a `hidden beast` number, since 55 + 611 = 666.

55611 is a nontrivial binomial coefficient, being equal to C(334, 2).

It is not a de Polignac number, because 55611 - 2¹ = 55609 is a prime.

55611 is a Rhonda number in base 8.

It is not an unprimeable number, because it can be changed into a prime (55619) 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, 250 + ... + 416.

It is an arithmetic number, because the mean of its divisors is an integer number (6916).

2⁵⁵⁶¹¹ is an apocalyptic number.

55611 is the 333-rd triangular number and also the 167-th hexagonal number.

55611 is a deficient number, since it is larger than the sum of its proper divisors (27381).

55611 is a wasteful number, since it uses less digits than its factorization.

55611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 207 counting only the distinct ones).

The product of its digits is 150, while the sum is 18.

The square root of 55611 is about 235.8198464930. The cubic root of 55611 is about 38.1698308071.

Subtracting from 55611 its reverse (11655), we obtain a triangular number (43956 = T₂₉₆).

It can be divided in two parts, 556 and 11, that multiplied together give a palindrome (6116).

The spelling of 55611 in words is "fifty-five thousand, six hundred eleven".