505561000111 has 4 divisors (see below), whose sum is σ = 505563079824. Its totient is φ = 505558920400.

The previous prime is 505561000097. The next prime is 505561000159. The reversal of 505561000111 is 111000165505.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111000165505 = 5 ⋅22200033101.

It is a cyclic number.

It is not a de Polignac number, because 505561000111 - 2⁵ = 505561000079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505561001111) 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, 618235 + ... + 1180396.

It is an arithmetic number, because the mean of its divisors is an integer number (126390769956).

Almost surely, 2^505561000111 is an apocalyptic number.

505561000111 is a deficient number, since it is larger than the sum of its proper divisors (2079713).

505561000111 is a wasteful number, since it uses less digits than its factorization.

505561000111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2079712.

The product of its (nonzero) digits is 750, while the sum is 25.

Adding to 505561000111 its reverse (111000165505), we get a palindrome (616561165616).

The spelling of 505561000111 in words is "five hundred five billion, five hundred sixty-one million, one hundred eleven", and thus it is an aban number.