55505261 has 16 divisors (see below), whose sum is σ = 65401344. Its totient is φ = 46120704.

The previous prime is 55505227. The next prime is 55505297. The reversal of 55505261 is 16250555.

It is not a de Polignac number, because 55505261 - 2¹⁸ = 55243117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55505161) 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, 36431 + ... + 37923.

It is an arithmetic number, because the mean of its divisors is an integer number (4087584).

Almost surely, 2^55505261 is an apocalyptic number.

It is an amenable number.

55505261 is a deficient number, since it is larger than the sum of its proper divisors (9896083).

55505261 is a wasteful number, since it uses less digits than its factorization.

55505261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660.

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 55505261 is about 7450.1852997090. The cubic root of 55505261 is about 381.4562336316.

The spelling of 55505261 in words is "fifty-five million, five hundred five thousand, two hundred sixty-one".