111887191864 has 16 divisors (see below), whose sum is σ = 239758268400. Its totient is φ = 47951653632.

The previous prime is 111887191853. The next prime is 111887191873. The reversal of 111887191864 is 468191788111.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 998992729 + ... + 998992840.

It is an arithmetic number, because the mean of its divisors is an integer number (14984891775).

Almost surely, 2^111887191864 is an apocalyptic number.

111887191864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

111887191864 is an abundant number, since it is smaller than the sum of its proper divisors (127871076536).

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

111887191864 is a wasteful number, since it uses less digits than its factorization.

111887191864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1997985582 (or 1997985578 counting only the distinct ones).

The product of its digits is 774144, while the sum is 55.

The spelling of 111887191864 in words is "one hundred eleven billion, eight hundred eighty-seven million, one hundred ninety-one thousand, eight hundred sixty-four".