11555602221065 has 32 divisors (see below), whose sum is σ = 15878152872960. Its totient is φ = 7908609369024.

The previous prime is 11555602221061. The next prime is 11555602221113. The reversal of 11555602221065 is 56012220655511.

It is not a de Polignac number, because 11555602221065 - 2² = 11555602221061 is a prime.

It is a super-2 number, since 2×11555602221065² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11555602221061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 269597606 + ... + 269640464.

It is an arithmetic number, because the mean of its divisors is an integer number (496192277280).

Almost surely, 2^{11555602221065} is an apocalyptic number.

It is an amenable number.

11555602221065 is a deficient number, since it is larger than the sum of its proper divisors (4322550651895).

11555602221065 is a wasteful number, since it uses less digits than its factorization.

11555602221065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57501.

The product of its (nonzero) digits is 180000, while the sum is 41.

Adding to 11555602221065 its reverse (56012220655511), we get a palindrome (67567822876576).

The spelling of 11555602221065 in words is "eleven trillion, five hundred fifty-five billion, six hundred two million, two hundred twenty-one thousand, sixty-five".