561511244065 has 4 divisors (see below), whose sum is σ = 673813492884. Its totient is φ = 449208995248.

The previous prime is 561511244051. The next prime is 561511244071. The reversal of 561511244065 is 560442115165.

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

It can be written as a sum of positive squares in 2 ways, for example, as 106114365504 + 455396878561 = 325752^2 + 674831^2 .

It is a cyclic number.

It is not a de Polignac number, because 561511244065 - 2⁵ = 561511244033 is a prime.

It is a super-2 number, since 2×561511244065² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56151124402 + ... + 56151124411.

It is an arithmetic number, because the mean of its divisors is an integer number (168453373221).

Almost surely, 2^561511244065 is an apocalyptic number.

It is an amenable number.

561511244065 is a deficient number, since it is larger than the sum of its proper divisors (112302248819).

561511244065 is a wasteful number, since it uses less digits than its factorization.

561511244065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112302248818.

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 561511244065 in words is "five hundred sixty-one billion, five hundred eleven million, two hundred forty-four thousand, sixty-five".