11115660013565 has 16 divisors (see below), whose sum is σ = 13364128623216. Its totient is φ = 8875643904000.

The previous prime is 11115660013559. The next prime is 11115660013571. The reversal of 11115660013565 is 56531006651111.

It is an interprime number because it is at equal distance from previous prime (11115660013559) and next prime (11115660013571).

It can be written as a sum of positive squares in 8 ways, for example, as 268003971481 + 10847656042084 = 517691^2 + 3293578^2 .

It is not a de Polignac number, because 11115660013565 - 2¹⁴ = 11115659997181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12407525 + ... + 13273205.

It is an arithmetic number, because the mean of its divisors is an integer number (835258038951).

Almost surely, 2^{11115660013565} is an apocalyptic number.

It is an amenable number.

11115660013565 is a deficient number, since it is larger than the sum of its proper divisors (2248468609651).

11115660013565 is an equidigital number, since it uses as much as digits as its factorization.

11115660013565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870560.

The product of its (nonzero) digits is 81000, while the sum is 41.

Adding to 11115660013565 its reverse (56531006651111), we get a palindrome (67646666664676).

The spelling of 11115660013565 in words is "eleven trillion, one hundred fifteen billion, six hundred sixty million, thirteen thousand, five hundred sixty-five".