505520123313 has 4 divisors (see below), whose sum is σ = 674026831088. Its totient is φ = 337013415540.

The previous prime is 505520123233. The next prime is 505520123323. The reversal of 505520123313 is 313321025505.

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.

It is not a de Polignac number, because 505520123313 - 2²¹ = 505518026161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505520123323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84253353883 + ... + 84253353888.

It is an arithmetic number, because the mean of its divisors is an integer number (168506707772).

Almost surely, 2^505520123313 is an apocalyptic number.

It is an amenable number.

505520123313 is a deficient number, since it is larger than the sum of its proper divisors (168506707775).

505520123313 is a wasteful number, since it uses less digits than its factorization.

505520123313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168506707774.

The product of its (nonzero) digits is 13500, while the sum is 30.

Adding to 505520123313 its reverse (313321025505), we get a palindrome (818841148818).

The spelling of 505520123313 in words is "five hundred five billion, five hundred twenty million, one hundred twenty-three thousand, three hundred thirteen".