520223217771 has 4 divisors (see below), whose sum is σ = 693630957032. Its totient is φ = 346815478512.

The previous prime is 520223217757. The next prime is 520223217797. The reversal of 520223217771 is 177712322025.

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

It is not a de Polignac number, because 520223217771 - 2¹¹ = 520223215723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520223217721) 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, 86703869626 + ... + 86703869631.

It is an arithmetic number, because the mean of its divisors is an integer number (173407739258).

Almost surely, 2^520223217771 is an apocalyptic number.

520223217771 is a deficient number, since it is larger than the sum of its proper divisors (173407739261).

520223217771 is a wasteful number, since it uses less digits than its factorization.

520223217771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173407739260.

The product of its (nonzero) digits is 82320, while the sum is 39.

Adding to 520223217771 its reverse (177712322025), we get a palindrome (697935539796).

The spelling of 520223217771 in words is "five hundred twenty billion, two hundred twenty-three million, two hundred seventeen thousand, seven hundred seventy-one".