111685921959 has 8 divisors (see below), whose sum is σ = 148917339520. Its totient is φ = 74455892856.

The previous prime is 111685921951. The next prime is 111685921967. The reversal of 111685921959 is 959129586111.

It is an interprime number because it is at equal distance from previous prime (111685921951) and next prime (111685921967).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111685921959 - 2³ = 111685921951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111685921899 and 111685921908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111685921951) 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, 142129 + ... + 493530.

It is an arithmetic number, because the mean of its divisors is an integer number (18614667440).

Almost surely, 2^111685921959 is an apocalyptic number.

111685921959 is a deficient number, since it is larger than the sum of its proper divisors (37231417561).

111685921959 is an equidigital number, since it uses as much as digits as its factorization.

111685921959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694229.

The product of its digits is 1749600, while the sum is 57.

The spelling of 111685921959 in words is "one hundred eleven billion, six hundred eighty-five million, nine hundred twenty-one thousand, nine hundred fifty-nine".