55205613 has 12 divisors (see below), whose sum is σ = 84432348. Its totient is φ = 34638720.

The previous prime is 55205611. The next prime is 55205617. The reversal of 55205613 is 31650255.

It can be written as a sum of positive squares in 2 ways, for example, as 16305444 + 38900169 = 4038^2 + 6237^2 .

It is not a de Polignac number, because 55205613 - 2¹ = 55205611 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55205611) 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, 180258 + ... + 180563.

It is an arithmetic number, because the mean of its divisors is an integer number (7036029).

Almost surely, 2^55205613 is an apocalyptic number.

It is an amenable number.

55205613 is a deficient number, since it is larger than the sum of its proper divisors (29226735).

55205613 is a wasteful number, since it uses less digits than its factorization.

55205613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360844 (or 360841 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 55205613 is about 7430.0479810025. The cubic root of 55205613 is about 380.7685576405.

Adding to 55205613 its reverse (31650255), we get a palindrome (86855868).

The spelling of 55205613 in words is "fifty-five million, two hundred five thousand, six hundred thirteen".