55205503 has 4 divisors (see below), whose sum is σ = 55640320. Its totient is φ = 54770688.

The previous prime is 55205483. The next prime is 55205509. The reversal of 55205503 is 30550255.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55205503 - 2¹⁷ = 55074431 is a prime.

It is a super-2 number, since 2×55205503² = 6095295122966018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55205509) 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 3 ways as a sum of consecutive naturals, for example, 217218 + ... + 217471.

It is an arithmetic number, because the mean of its divisors is an integer number (13910080).

Almost surely, 2^55205503 is an apocalyptic number.

55205503 is a deficient number, since it is larger than the sum of its proper divisors (434817).

55205503 is a wasteful number, since it uses less digits than its factorization.

55205503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434816.

The product of its (nonzero) digits is 3750, while the sum is 25.

The square root of 55205503 is about 7430.0405786240. The cubic root of 55205503 is about 380.7683047401.

Adding to 55205503 its reverse (30550255), we get a palindrome (85755758).

The spelling of 55205503 in words is "fifty-five million, two hundred five thousand, five hundred three".