550938221685 has 24 divisors (see below), whose sum is σ = 955682593944. Its totient is φ = 293611253760.

The previous prime is 550938221683. The next prime is 550938221689. The reversal of 550938221685 is 586122839055.

It is a happy number.

550938221685 is a `hidden beast` number, since 5 + 509 + 38 + 2 + 21 + 6 + 85 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 270539377956 + 280398843729 = 520134^2 + 529527^2 .

It is not a de Polignac number, because 550938221685 - 2¹ = 550938221683 is a prime.

It is a super-2 number, since 2×550938221685² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550938221683) 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, 4574572 + ... + 4693461.

It is an arithmetic number, because the mean of its divisors is an integer number (39820108081).

Almost surely, 2^550938221685 is an apocalyptic number.

It is an amenable number.

550938221685 is a deficient number, since it is larger than the sum of its proper divisors (404744372259).

550938221685 is a wasteful number, since it uses less digits than its factorization.

550938221685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9269365 (or 9269362 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 54.

The spelling of 550938221685 in words is "five hundred fifty billion, nine hundred thirty-eight million, two hundred twenty-one thousand, six hundred eighty-five".