2113520065565 has 8 divisors (see below), whose sum is σ = 2536237676760. Its totient is φ = 1690806987072.

The previous prime is 2113520065519. The next prime is 2113520065571. The reversal of 2113520065565 is 5655600253112.

It can be written as a sum of positive squares in 4 ways, for example, as 157921991236 + 1955598074329 = 397394^2 + 1398427^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2113520065565 - 2¹⁰ = 2113520064541 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5294 + ... + 2055983.

It is an arithmetic number, because the mean of its divisors is an integer number (317029709595).

Almost surely, 2^{2113520065565} is an apocalyptic number.

It is an amenable number.

2113520065565 is a deficient number, since it is larger than the sum of its proper divisors (422717611195).

2113520065565 is a wasteful number, since it uses less digits than its factorization.

2113520065565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2266351.

The product of its (nonzero) digits is 270000, while the sum is 41.

The spelling of 2113520065565 in words is "two trillion, one hundred thirteen billion, five hundred twenty million, sixty-five thousand, five hundred sixty-five".