11213537565 has 16 divisors (see below), whose sum is σ = 18031824000. Its totient is φ = 5950498752.

The previous prime is 11213537563. The next prime is 11213537609. The reversal of 11213537565 is 56573531211.

It is not a de Polignac number, because 11213537565 - 2¹ = 11213537563 is a prime.

It is a super-2 number, since 2×11213537565² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11213537563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1875330 + ... + 1881299.

It is an arithmetic number, because the mean of its divisors is an integer number (1126989000).

Almost surely, 2^11213537565 is an apocalyptic number.

11213537565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11213537565 is a deficient number, since it is larger than the sum of its proper divisors (6818286435).

11213537565 is a wasteful number, since it uses less digits than its factorization.

11213537565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3756836.

The product of its digits is 94500, while the sum is 39.

The spelling of 11213537565 in words is "eleven billion, two hundred thirteen million, five hundred thirty-seven thousand, five hundred sixty-five".