550666809 has 32 divisors (see below), whose sum is σ = 1017108480. Its totient is φ = 286059600.

The previous prime is 550666799. The next prime is 550666843. The reversal of 550666809 is 908666055.

It is not a de Polignac number, because 550666809 - 2⁷ = 550666681 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (550666009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130357 + ... + 134514.

It is an arithmetic number, because the mean of its divisors is an integer number (31784640).

Almost surely, 2^550666809 is an apocalyptic number.

It is an amenable number.

550666809 is a deficient number, since it is larger than the sum of its proper divisors (466441671).

550666809 is a wasteful number, since it uses less digits than its factorization.

550666809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264898 (or 264892 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 550666809 is about 23466.2909084499. The cubic root of 550666809 is about 819.6522464545.

The spelling of 550666809 in words is "five hundred fifty million, six hundred sixty-six thousand, eight hundred nine".