11564443551065 has 16 divisors (see below), whose sum is σ = 13949473190400. Its totient is φ = 9203558745792.

The previous prime is 11564443551013. The next prime is 11564443551083. The reversal of 11564443551065 is 56015534446511.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11564443551065 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5170130 + ... + 7061099.

It is an arithmetic number, because the mean of its divisors is an integer number (871842074400).

Almost surely, 2^{11564443551065} is an apocalyptic number.

It is an amenable number.

11564443551065 is a deficient number, since it is larger than the sum of its proper divisors (2385029639335).

11564443551065 is a wasteful number, since it uses less digits than its factorization.

11564443551065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12232216.

The product of its (nonzero) digits is 4320000, while the sum is 50.

Adding to 11564443551065 its reverse (56015534446511), we get a palindrome (67579977997576).

The spelling of 11564443551065 in words is "eleven trillion, five hundred sixty-four billion, four hundred forty-three million, five hundred fifty-one thousand, sixty-five".