500111660561 has 4 divisors (see below), whose sum is σ = 501240581232. Its totient is φ = 498982739892.

The previous prime is 500111660537. The next prime is 500111660599. The reversal of 500111660561 is 165066111005.

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 a cyclic number.

It is not a de Polignac number, because 500111660561 - 2²⁶ = 500044551697 is a prime.

It is a super-2 number, since 2×500111660561² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (500111660161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564459671 + ... + 564460556.

It is an arithmetic number, because the mean of its divisors is an integer number (125310145308).

Almost surely, 2^500111660561 is an apocalyptic number.

It is an amenable number.

500111660561 is a deficient number, since it is larger than the sum of its proper divisors (1128920671).

500111660561 is a wasteful number, since it uses less digits than its factorization.

500111660561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128920670.

The product of its (nonzero) digits is 5400, while the sum is 32.

Adding to 500111660561 its reverse (165066111005), we get a palindrome (665177771566).

The spelling of 500111660561 in words is "five hundred billion, one hundred eleven million, six hundred sixty thousand, five hundred sixty-one".