11555663565611 has 16 divisors (see below), whose sum is σ = 12965622724608. Its totient is φ = 10206433576800.

The previous prime is 11555663565599. The next prime is 11555663565653. The reversal of 11555663565611 is 11656536655511.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11555663565611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11555663565211) by changing a digit.

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, 20263115 + ... + 20825588.

It is an arithmetic number, because the mean of its divisors is an integer number (810351420288).

Almost surely, 2^{11555663565611} is an apocalyptic number.

11555663565611 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11555663565611 is a deficient number, since it is larger than the sum of its proper divisors (1409959158997).

11555663565611 is a wasteful number, since it uses less digits than its factorization.

11555663565611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41089442.

The product of its digits is 12150000, while the sum is 56.

The spelling of 11555663565611 in words is "eleven trillion, five hundred fifty-five billion, six hundred sixty-three million, five hundred sixty-five thousand, six hundred eleven".