5505555560561 has 16 divisors (see below), whose sum is σ = 6442412600448. Its totient is φ = 4606422912000.

The previous prime is 5505555560537. The next prime is 5505555560567. The reversal of 5505555560561 is 1650655555055.

It is a de Polignac number, because none of the positive numbers 2^k-5505555560561 is a prime.

It is a super-2 number, since 2×5505555560561² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5505555560567) 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, 5230430 + ... + 6194231.

It is an arithmetic number, because the mean of its divisors is an integer number (402650787528).

Almost surely, 2^{5505555560561} is an apocalyptic number.

It is an amenable number.

5505555560561 is a deficient number, since it is larger than the sum of its proper divisors (936857039887).

5505555560561 is a wasteful number, since it uses less digits than its factorization.

5505555560561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11426312.

The product of its (nonzero) digits is 14062500, while the sum is 53.

It can be divided in two parts, 550555 and 5560561, that added together give a palindrome (6111116).

The spelling of 5505555560561 in words is "five trillion, five hundred five billion, five hundred fifty-five million, five hundred sixty thousand, five hundred sixty-one".