11011009878 has 24 divisors (see below), whose sum is σ = 26026023816. Its totient is φ = 3336669600.

The previous prime is 11011009873. The next prime is 11011009879. The reversal of 11011009878 is 87890011011.

It is a happy number.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011009873) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27805383 + ... + 27805778.

It is an arithmetic number, because the mean of its divisors is an integer number (1084417659).

Almost surely, 2^11011009878 is an apocalyptic number.

11011009878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11011009878 is an abundant number, since it is smaller than the sum of its proper divisors (15015013938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11011009878 is a wasteful number, since it uses less digits than its factorization.

11011009878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55611180 (or 55611177 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 36.

The spelling of 11011009878 in words is "eleven billion, eleven million, nine thousand, eight hundred seventy-eight".