111978671775 has 24 divisors (see below), whose sum is σ = 186595866624. Its totient is φ = 59251701600.

The previous prime is 111978671773. The next prime is 111978671803. The reversal of 111978671775 is 577176879111.

It is not a de Polignac number, because 111978671775 - 2¹ = 111978671773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111978671771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5868621 + ... + 5887670.

It is an arithmetic number, because the mean of its divisors is an integer number (7774827776).

Almost surely, 2^111978671775 is an apocalyptic number.

111978671775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

111978671775 is a deficient number, since it is larger than the sum of its proper divisors (74617194849).

111978671775 is a wasteful number, since it uses less digits than its factorization.

111978671775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11756431 (or 11756426 counting only the distinct ones).

The product of its digits is 5186160, while the sum is 60.

The spelling of 111978671775 in words is "one hundred eleven billion, nine hundred seventy-eight million, six hundred seventy-one thousand, seven hundred seventy-five".