555505055561 has 4 divisors (see below), whose sum is σ = 555823033872. Its totient is φ = 555187077252.

The previous prime is 555505055543. The next prime is 555505055563. The reversal of 555505055561 is 165550505555.

555505055561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 165550505555 = 5 ⋅33110101111.

It is a cyclic number.

It is not a de Polignac number, because 555505055561 - 2¹⁰ = 555505054537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (555505055563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158986535 + ... + 158990028.

It is an arithmetic number, because the mean of its divisors is an integer number (138955758468).

Almost surely, 2^555505055561 is an apocalyptic number.

It is an amenable number.

555505055561 is a deficient number, since it is larger than the sum of its proper divisors (317978311).

555505055561 is a wasteful number, since it uses less digits than its factorization.

555505055561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317978310.

The product of its (nonzero) digits is 2343750, while the sum is 47.

The spelling of 555505055561 in words is "five hundred fifty-five billion, five hundred five million, fifty-five thousand, five hundred sixty-one".