500011000561 has 2 divisors, whose sum is σ = 500011000562. Its totient is φ = 500011000560.

The previous prime is 500011000547. The next prime is 500011000637. The reversal of 500011000561 is 165000110005.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 478179165025 + 21831835536 = 691505^2 + 147756^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-500011000561 is a prime.

It is a super-2 number, since 2×500011000561² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (500011000361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250005500280 + 250005500281.

It is an arithmetic number, because the mean of its divisors is an integer number (250005500281).

Almost surely, 2^500011000561 is an apocalyptic number.

It is an amenable number.

500011000561 is a deficient number, since it is larger than the sum of its proper divisors (1).

500011000561 is an equidigital number, since it uses as much as digits as its factorization.

500011000561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150, while the sum is 19.

Adding to 500011000561 its reverse (165000110005), we get a palindrome (665011110566).

The spelling of 500011000561 in words is "five hundred billion, eleven million, five hundred sixty-one", and thus it is an aban number.