11555111012 has 48 divisors (see below), whose sum is σ = 20865600000. Its totient is φ = 5597289984.

The previous prime is 11555111011. The next prime is 11555111017. The reversal of 11555111012 is 21011155511.

It is not an unprimeable number, because it can be changed into a prime (11555111011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3851489 + ... + 3854487.

It is an arithmetic number, because the mean of its divisors is an integer number (434700000).

Almost surely, 2^11555111012 is an apocalyptic number.

It is an amenable number.

11555111012 is a deficient number, since it is larger than the sum of its proper divisors (9310488988).

11555111012 is a wasteful number, since it uses less digits than its factorization.

11555111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3308 (or 3306 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 23.

Adding to 11555111012 its reverse (21011155511), we get a palindrome (32566266523).

The spelling of 11555111012 in words is "eleven billion, five hundred fifty-five million, one hundred eleven thousand, twelve".