55209663 has 24 divisors (see below), whose sum is σ = 81703440. Its totient is φ = 35913600.

The previous prime is 55209619. The next prime is 55209673. The reversal of 55209663 is 36690255.

It is not a de Polignac number, because 55209663 - 2⁹ = 55209151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55209673) 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 23 ways as a sum of consecutive naturals, for example, 91563 + ... + 92163.

It is an arithmetic number, because the mean of its divisors is an integer number (3404310).

Almost surely, 2^55209663 is an apocalyptic number.

55209663 is a deficient number, since it is larger than the sum of its proper divisors (26493777).

55209663 is a wasteful number, since it uses less digits than its factorization.

55209663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839 (or 836 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 55209663 is about 7430.3205179857. The cubic root of 55209663 is about 380.7778687405. Note that the first 3 decimals are identical.

The spelling of 55209663 in words is "fifty-five million, two hundred nine thousand, six hundred sixty-three".