111621717055 has 12 divisors (see below), whose sum is σ = 137133538920. Its totient is φ = 87220683312.

The previous prime is 111621717017. The next prime is 111621717071. The reversal of 111621717055 is 550717126111.

It is a happy number.

It is not a de Polignac number, because 111621717055 - 2⁹ = 111621716543 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 6027625 + ... + 6046114.

It is an arithmetic number, because the mean of its divisors is an integer number (11427794910).

Almost surely, 2^111621717055 is an apocalyptic number.

111621717055 is a deficient number, since it is larger than the sum of its proper divisors (25511821865).

111621717055 is an equidigital number, since it uses as much as digits as its factorization.

111621717055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12073830 (or 12073787 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 37.

The spelling of 111621717055 in words is "one hundred eleven billion, six hundred twenty-one million, seven hundred seventeen thousand, fifty-five".