10115561565 has 12 divisors (see below), whose sum is σ = 17533640124. Its totient is φ = 5394966144.

The previous prime is 10115561551. The next prime is 10115561567. The reversal of 10115561565 is 56516551101.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6154873209 + 3960688356 = 78453^2 + 62934^2 .

It is a de Polignac number, because none of the positive numbers 2^k-10115561565 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10115561567) 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, 112395084 + ... + 112395173.

It is an arithmetic number, because the mean of its divisors is an integer number (1461136677).

Almost surely, 2^10115561565 is an apocalyptic number.

10115561565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10115561565 is a deficient number, since it is larger than the sum of its proper divisors (7418078559).

10115561565 is a wasteful number, since it uses less digits than its factorization.

10115561565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224790268 (or 224790265 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 10115561565 in words is "ten billion, one hundred fifteen million, five hundred sixty-one thousand, five hundred sixty-five".