11111128557401 has 4 divisors (see below), whose sum is σ = 11347535548032. Its totient is φ = 10874721566772.

The previous prime is 11111128557367. The next prime is 11111128557499. The reversal of 11111128557401 is 10475582111111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11111128557401 - 2⁶ = 11111128557337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111128557601) by changing a digit.

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, 118203495245 + ... + 118203495338.

It is an arithmetic number, because the mean of its divisors is an integer number (2836883887008).

Almost surely, 2^{11111128557401} is an apocalyptic number.

It is an amenable number.

11111128557401 is a deficient number, since it is larger than the sum of its proper divisors (236406990631).

11111128557401 is an equidigital number, since it uses as much as digits as its factorization.

11111128557401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236406990630.

The product of its (nonzero) digits is 11200, while the sum is 38.

The spelling of 11111128557401 in words is "eleven trillion, one hundred eleven billion, one hundred twenty-eight million, five hundred fifty-seven thousand, four hundred one".