11111108888887 has 12 divisors (see below), whose sum is σ = 13002563705040. Its totient is φ = 9466778823936.

The previous prime is 11111108888861. The next prime is 11111108888921. The reversal of 11111108888887 is 78888880111111.

It is not a de Polignac number, because 11111108888887 - 2³¹ = 11108961405239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111108888807) 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, 678905962 + ... + 678922327.

It is an arithmetic number, because the mean of its divisors is an integer number (1083546975420).

Almost surely, 2^{11111108888887} is an apocalyptic number.

11111108888887 is a deficient number, since it is larger than the sum of its proper divisors (1891454816153).

11111108888887 is a wasteful number, since it uses less digits than its factorization.

11111108888887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357828470 (or 1357828463 counting only the distinct ones).

The product of its (nonzero) digits is 1835008, while the sum is 61.

Adding to 11111108888887 its reverse (78888880111111), we get a palindrome (89999988999998).

The spelling of 11111108888887 in words is "eleven trillion, one hundred eleven billion, one hundred eight million, eight hundred eighty-eight thousand, eight hundred eighty-seven".