11556056332655 has 4 divisors (see below), whose sum is σ = 13867267599192. Its totient is φ = 9244845066120.

The previous prime is 11556056332603. The next prime is 11556056332693. The reversal of 11556056332655 is 55623365065511.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 11556056332655 - 2³⁸ = 11281178425711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11556056332597 and 11556056332606.

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 3 ways as a sum of consecutive naturals, for example, 1155605633261 + ... + 1155605633270.

It is an arithmetic number, because the mean of its divisors is an integer number (3466816899798).

Almost surely, 2^{11556056332655} is an apocalyptic number.

11556056332655 is a deficient number, since it is larger than the sum of its proper divisors (2311211266537).

11556056332655 is an equidigital number, since it uses as much as digits as its factorization.

11556056332655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311211266536.

The product of its (nonzero) digits is 12150000, while the sum is 53.

The spelling of 11556056332655 in words is "eleven trillion, five hundred fifty-six billion, fifty-six million, three hundred thirty-two thousand, six hundred fifty-five".