111684426638478 has 16 divisors (see below), whose sum is σ = 223847159178240. Its totient is φ = 37148424562616.

The previous prime is 111684426638437. The next prime is 111684426638503. The reversal of 111684426638478 is 874836624486111.

It is a super-2 number, since 2×111684426638478² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19929409518 + ... + 19929415121.

It is an arithmetic number, because the mean of its divisors is an integer number (13990447448640).

Almost surely, 2^{111684426638478} is an apocalyptic number.

111684426638478 is an abundant number, since it is smaller than the sum of its proper divisors (112162732539762).

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

111684426638478 is a wasteful number, since it uses less digits than its factorization.

111684426638478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39858825111.

The product of its digits is 297271296, while the sum is 69.

The spelling of 111684426638478 in words is "one hundred eleven trillion, six hundred eighty-four billion, four hundred twenty-six million, six hundred thirty-eight thousand, four hundred seventy-eight".