11556255565 has 8 divisors (see below), whose sum is σ = 13876828920. Its totient is φ = 9238789632.

The previous prime is 11556255541. The next prime is 11556255611. The reversal of 11556255565 is 56555265511.

It can be written as a sum of positive squares in 4 ways, for example, as 872552521 + 10683703044 = 29539^2 + 103362^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11556255565 - 2⁵ = 11556255533 is a prime.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 768664 + ... + 783553.

It is an arithmetic number, because the mean of its divisors is an integer number (1734603615).

Almost surely, 2^11556255565 is an apocalyptic number.

It is an amenable number.

11556255565 is a deficient number, since it is larger than the sum of its proper divisors (2320573355).

11556255565 is a wasteful number, since it uses less digits than its factorization.

11556255565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553711.

The product of its digits is 1125000, while the sum is 46.

The spelling of 11556255565 in words is "eleven billion, five hundred fifty-six million, two hundred fifty-five thousand, five hundred sixty-five".