111731664641 has 4 divisors (see below), whose sum is σ = 111927342384. Its totient is φ = 111535986900.

The previous prime is 111731664619. The next prime is 111731664659. The reversal of 111731664641 is 146466137111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111731664641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111731664601) 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 3 ways as a sum of consecutive naturals, for example, 97838015 + ... + 97839156.

It is an arithmetic number, because the mean of its divisors is an integer number (27981835596).

Almost surely, 2^111731664641 is an apocalyptic number.

It is an amenable number.

111731664641 is a deficient number, since it is larger than the sum of its proper divisors (195677743).

111731664641 is an equidigital number, since it uses as much as digits as its factorization.

111731664641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195677742.

The product of its digits is 72576, while the sum is 41.

The spelling of 111731664641 in words is "one hundred eleven billion, seven hundred thirty-one million, six hundred sixty-four thousand, six hundred forty-one".