111887191863 has 8 divisors (see below), whose sum is σ = 165758802800. Its totient is φ = 74591461224.

The previous prime is 111887191853. The next prime is 111887191873. The reversal of 111887191863 is 368191788111.

It is an interprime number because it is at equal distance from previous prime (111887191853) and next prime (111887191873).

It is not a de Polignac number, because 111887191863 - 2³⁰ = 110813450039 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 (111887191813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2071985008 + ... + 2071985061.

It is an arithmetic number, because the mean of its divisors is an integer number (20719850350).

Almost surely, 2^111887191863 is an apocalyptic number.

111887191863 is a deficient number, since it is larger than the sum of its proper divisors (53871610937).

111887191863 is an equidigital number, since it uses as much as digits as its factorization.

111887191863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4143970078 (or 4143970072 counting only the distinct ones).

The product of its digits is 580608, while the sum is 54.

The spelling of 111887191863 in words is "one hundred eleven billion, eight hundred eighty-seven million, one hundred ninety-one thousand, eight hundred sixty-three".