505500511111 has 4 divisors (see below), whose sum is σ = 535235835312. Its totient is φ = 475765186912.

The previous prime is 505500511079. The next prime is 505500511133. The reversal of 505500511111 is 111115005505.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 505500511111 - 2⁵ = 505500511079 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 (505500511141) 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, 14867662075 + ... + 14867662108.

It is an arithmetic number, because the mean of its divisors is an integer number (133808958828).

Almost surely, 2^505500511111 is an apocalyptic number.

505500511111 is a deficient number, since it is larger than the sum of its proper divisors (29735324201).

505500511111 is a wasteful number, since it uses less digits than its factorization.

505500511111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29735324200.

The product of its (nonzero) digits is 625, while the sum is 25.

Adding to 505500511111 its reverse (111115005505), we get a palindrome (616615516616).

The spelling of 505500511111 in words is "five hundred five billion, five hundred million, five hundred eleven thousand, one hundred eleven".