10561111065 has 24 divisors (see below), whose sum is σ = 18309150600. Its totient is φ = 5631600384.

The previous prime is 10561111039. The next prime is 10561111087. The reversal of 10561111065 is 56011116501.

It can be written as a sum of positive squares in 4 ways, for example, as 1515389184 + 9045721881 = 38928^2 + 95109^2 .

It is not a de Polignac number, because 10561111065 - 2⁸ = 10561110809 is a prime.

It is a super-2 number, since 2×10561111065² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 288411 + ... + 322959.

It is an arithmetic number, because the mean of its divisors is an integer number (762881275).

Almost surely, 2^10561111065 is an apocalyptic number.

10561111065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10561111065 is a deficient number, since it is larger than the sum of its proper divisors (7748039535).

10561111065 is a wasteful number, since it uses less digits than its factorization.

10561111065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41353 (or 41350 counting only the distinct ones).

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

Adding to 10561111065 its reverse (56011116501), we get a palindrome (66572227566).

The spelling of 10561111065 in words is "ten billion, five hundred sixty-one million, one hundred eleven thousand, sixty-five".