11555071655 has 4 divisors (see below), whose sum is σ = 13866085992. Its totient is φ = 9244057320.

The previous prime is 11555071651. The next prime is 11555071709. The reversal of 11555071655 is 55617055511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55617055511 = 1447 ⋅38436113.

It is not a de Polignac number, because 11555071655 - 2² = 11555071651 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11555071651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1155507161 + ... + 1155507170.

It is an arithmetic number, because the mean of its divisors is an integer number (3466521498).

Almost surely, 2^11555071655 is an apocalyptic number.

11555071655 is a deficient number, since it is larger than the sum of its proper divisors (2311014337).

11555071655 is an equidigital number, since it uses as much as digits as its factorization.

11555071655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2311014336.

The product of its (nonzero) digits is 131250, while the sum is 41.

The spelling of 11555071655 in words is "eleven billion, five hundred fifty-five million, seventy-one thousand, six hundred fifty-five".