11111111109928 has 8 divisors (see below), whose sum is σ = 20833333331130. Its totient is φ = 5555555554960.

The previous prime is 11111111109911. The next prime is 11111111109929. The reversal of 11111111109928 is 82990111111111.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 8526855526084 + 2584255583844 = 2920078^2 + 1607562^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (11111111109929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694444444363 + ... + 694444444378.

Almost surely, 2^{11111111109928} is an apocalyptic number.

It is an amenable number.

11111111109928 is a deficient number, since it is larger than the sum of its proper divisors (9722222221202).

11111111109928 is a wasteful number, since it uses less digits than its factorization.

11111111109928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388888888747 (or 1388888888743 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 37.

The spelling of 11111111109928 in words is "eleven trillion, one hundred eleven billion, one hundred eleven million, one hundred nine thousand, nine hundred twenty-eight".