111687878061 has 12 divisors (see below), whose sum is σ = 161548852192. Its totient is φ = 74356162056.

The previous prime is 111687878053. The next prime is 111687878101. The reversal of 111687878061 is 160878786111.

It is not a de Polignac number, because 111687878061 - 2³ = 111687878053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111687877989 and 111687878007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111687878051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8528371 + ... + 8541456.

Almost surely, 2^111687878061 is an apocalyptic number.

It is an amenable number.

111687878061 is a deficient number, since it is larger than the sum of its proper divisors (49860974131).

111687878061 is a wasteful number, since it uses less digits than its factorization.

111687878061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17070560 (or 17070557 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 54.

The spelling of 111687878061 in words is "one hundred eleven billion, six hundred eighty-seven million, eight hundred seventy-eight thousand, sixty-one".