11011994881 has 4 divisors (see below), whose sum is σ = 11280580164. Its totient is φ = 10743409600.

The previous prime is 11011994837. The next prime is 11011994899. The reversal of 11011994881 is 18849911011.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6344919025 + 4667075856 = 79655^2 + 68316^2 .

It is a cyclic number.

It is not a de Polignac number, because 11011994881 - 2¹⁷ = 11011863809 is a prime.

It is a super-2 number, since 2×11011994881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11011994821) 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, 134292580 + ... + 134292661.

It is an arithmetic number, because the mean of its divisors is an integer number (2820145041).

Almost surely, 2^11011994881 is an apocalyptic number.

It is an amenable number.

11011994881 is a deficient number, since it is larger than the sum of its proper divisors (268585283).

11011994881 is an equidigital number, since it uses as much as digits as its factorization.

11011994881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268585282.

The product of its (nonzero) digits is 20736, while the sum is 43.

The spelling of 11011994881 in words is "eleven billion, eleven million, nine hundred ninety-four thousand, eight hundred eighty-one".