55561611 has 32 divisors (see below), whose sum is σ = 86704128. Its totient is φ = 30996000.

The previous prime is 55561609. The next prime is 55561619. The reversal of 55561611 is 11616555.

55561611 is a nontrivial binomial coefficient, being equal to C(10542, 2).

It is not a de Polignac number, because 55561611 - 2¹ = 55561609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55561619) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 221236 + ... + 221486.

It is an arithmetic number, because the mean of its divisors is an integer number (2709504).

Almost surely, 2^55561611 is an apocalyptic number.

55561611 is the 10541-st triangular number and also the 5271-st hexagonal number.

55561611 is a deficient number, since it is larger than the sum of its proper divisors (31142517).

55561611 is a wasteful number, since it uses less digits than its factorization.

55561611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471.

The product of its digits is 4500, while the sum is 30.

The square root of 55561611 is about 7453.9661254932. The cubic root of 55561611 is about 381.5852771878.

The spelling of 55561611 in words is "fifty-five million, five hundred sixty-one thousand, six hundred eleven".