11011994879 has 4 divisors (see below), whose sum is σ = 11198638920. Its totient is φ = 10825350840.

The previous prime is 11011994837. The next prime is 11011994899. The reversal of 11011994879 is 97849911011.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11011994879 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 (11011994899) 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, 93321932 + ... + 93322049.

It is an arithmetic number, because the mean of its divisors is an integer number (2799659730).

Almost surely, 2^11011994879 is an apocalyptic number.

11011994879 is a deficient number, since it is larger than the sum of its proper divisors (186644041).

11011994879 is an equidigital number, since it uses as much as digits as its factorization.

11011994879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186644040.

The product of its (nonzero) digits is 163296, while the sum is 50.

The spelling of 11011994879 in words is "eleven billion, eleven million, nine hundred ninety-four thousand, eight hundred seventy-nine".