610111005561 has 12 divisors (see below), whose sum is σ = 881279306388. Its totient is φ = 406737045504.

The previous prime is 610111005547. The next prime is 610111005589. The reversal of 610111005561 is 165500111016.

610111005561 is a `hidden beast` number, since 6 + 1 + 0 + 1 + 1 + 100 + 556 + 1 = 666.

610111005561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 426841395561 + 183269610000 = 653331^2 + 428100^2 .

It is not a de Polignac number, because 610111005561 - 2⁵ = 610111005529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (610111005541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1112601 + ... + 1567833.

It is an arithmetic number, because the mean of its divisors is an integer number (73439942199).

Almost surely, 2^610111005561 is an apocalyptic number.

It is an amenable number.

610111005561 is a deficient number, since it is larger than the sum of its proper divisors (271168300827).

610111005561 is a wasteful number, since it uses less digits than its factorization.

610111005561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604152 (or 604149 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 27.

Adding to 610111005561 its reverse (165500111016), we get a palindrome (775611116577).

The spelling of 610111005561 in words is "six hundred ten billion, one hundred eleven million, five thousand, five hundred sixty-one".