550055538621 has 6 divisors (see below), whose sum is σ = 794524666910. Its totient is φ = 366703692408.

The previous prime is 550055538587. The next prime is 550055538631. The reversal of 550055538621 is 126835550055.

It is a happy number.

550055538621 is a `hidden beast` number, since 5 + 5 + 0 + 0 + 55 + 538 + 62 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 351216243225 + 198839295396 = 592635^2 + 445914^2 .

It is not a de Polignac number, because 550055538621 - 2⁷ = 550055538493 is a prime.

It is a super-2 number, since 2×550055538621² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550055538631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30558641026 + ... + 30558641043.

Almost surely, 2^550055538621 is an apocalyptic number.

It is an amenable number.

550055538621 is a deficient number, since it is larger than the sum of its proper divisors (244469128289).

550055538621 is a wasteful number, since it uses less digits than its factorization.

550055538621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61117282075 (or 61117282072 counting only the distinct ones).

The product of its (nonzero) digits is 900000, while the sum is 45.

The spelling of 550055538621 in words is "five hundred fifty billion, fifty-five million, five hundred thirty-eight thousand, six hundred twenty-one".