550521555561 has 16 divisors (see below), whose sum is σ = 851047816320. Its totient is φ = 351057223440.

The previous prime is 550521555553. The next prime is 550521555581. The reversal of 550521555561 is 165555125055.

It is not a de Polignac number, because 550521555561 - 2³ = 550521555553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (550521555541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 443253450 + ... + 443254691.

It is an arithmetic number, because the mean of its divisors is an integer number (53190488520).

Almost surely, 2^550521555561 is an apocalyptic number.

It is an amenable number.

550521555561 is a deficient number, since it is larger than the sum of its proper divisors (300526260759).

550521555561 is a wasteful number, since it uses less digits than its factorization.

550521555561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886508173 (or 886508167 counting only the distinct ones).

The product of its (nonzero) digits is 937500, while the sum is 45.

The spelling of 550521555561 in words is "five hundred fifty billion, five hundred twenty-one million, five hundred fifty-five thousand, five hundred sixty-one".