111561655005 has 48 divisors (see below), whose sum is σ = 198916458624. Its totient is φ = 57799163520.

The previous prime is 111561655003. The next prime is 111561655013. The reversal of 111561655005 is 500556165111.

It is a happy number.

It is not a de Polignac number, because 111561655005 - 2¹ = 111561655003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111561655001) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 997522 + ... + 1103708.

It is an arithmetic number, because the mean of its divisors is an integer number (4144092888).

Almost surely, 2^111561655005 is an apocalyptic number.

111561655005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

111561655005 is a deficient number, since it is larger than the sum of its proper divisors (87354803619).

111561655005 is a wasteful number, since it uses less digits than its factorization.

111561655005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106866 (or 106863 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 111561655005 in words is "one hundred eleven billion, five hundred sixty-one million, six hundred fifty-five thousand, five".