520660111251 has 8 divisors (see below), whose sum is σ = 793386836224. Its totient is φ = 297520063560.

The previous prime is 520660111217. The next prime is 520660111253. The reversal of 520660111251 is 152111066025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 520660111251 - 2⁶ = 520660111187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520660111253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12396669295 + ... + 12396669336.

It is an arithmetic number, because the mean of its divisors is an integer number (99173354528).

Almost surely, 2^520660111251 is an apocalyptic number.

520660111251 is a deficient number, since it is larger than the sum of its proper divisors (272726724973).

520660111251 is a wasteful number, since it uses less digits than its factorization.

520660111251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24793338641.

The product of its (nonzero) digits is 3600, while the sum is 30.

Adding to 520660111251 its reverse (152111066025), we get a palindrome (672771177276).

The spelling of 520660111251 in words is "five hundred twenty billion, six hundred sixty million, one hundred eleven thousand, two hundred fifty-one".