550660555561 has 4 divisors (see below), whose sum is σ = 550662317712. Its totient is φ = 550658793412.

The previous prime is 550660555553. The next prime is 550660555567. The reversal of 550660555561 is 165555066055.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165555066055 = 5 ⋅33111013211.

It is a cyclic number.

It is not a de Polignac number, because 550660555561 - 2³ = 550660555553 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (550660555567) 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, 271975 + ... + 1084108.

It is an arithmetic number, because the mean of its divisors is an integer number (137665579428).

Almost surely, 2^550660555561 is an apocalyptic number.

It is an amenable number.

550660555561 is a deficient number, since it is larger than the sum of its proper divisors (1762151).

550660555561 is a wasteful number, since it uses less digits than its factorization.

550660555561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762150.

The product of its (nonzero) digits is 3375000, while the sum is 49.

The spelling of 550660555561 in words is "five hundred fifty billion, six hundred sixty million, five hundred fifty-five thousand, five hundred sixty-one".