505005011111 has 4 divisors (see below), whose sum is σ = 505194083424. Its totient is φ = 504815938800.

The previous prime is 505005011101. The next prime is 505005011117. The reversal of 505005011111 is 111110500505.

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 505005011111 - 2⁶ = 505005011047 is a prime.

It is a super-2 number, since 2×505005011111² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505005011117) 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, 94532150 + ... + 94537491.

It is an arithmetic number, because the mean of its divisors is an integer number (126298520856).

Almost surely, 2^505005011111 is an apocalyptic number.

505005011111 is a deficient number, since it is larger than the sum of its proper divisors (189072313).

505005011111 is a wasteful number, since it uses less digits than its factorization.

505005011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189072312.

The product of its (nonzero) digits is 125, while the sum is 20.

Adding to 505005011111 its reverse (111110500505), we get a palindrome (616115511616).

The spelling of 505005011111 in words is "five hundred five billion, five million, eleven thousand, one hundred eleven".