111443661613 has 4 divisors (see below), whose sum is σ = 111444658780. Its totient is φ = 111442664448.

The previous prime is 111443661601. The next prime is 111443661629. The reversal of 111443661613 is 316166344111.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 101632164804 + 9811496809 = 318798^2 + 99053^2 .

It is a cyclic number.

It is not a de Polignac number, because 111443661613 - 2²¹ = 111441564461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111443661673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306198 + ... + 562711.

It is an arithmetic number, because the mean of its divisors is an integer number (27861164695).

Almost surely, 2^111443661613 is an apocalyptic number.

It is an amenable number.

111443661613 is a deficient number, since it is larger than the sum of its proper divisors (997167).

111443661613 is an equidigital number, since it uses as much as digits as its factorization.

111443661613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997166.

The product of its digits is 31104, while the sum is 37.

The spelling of 111443661613 in words is "one hundred eleven billion, four hundred forty-three million, six hundred sixty-one thousand, six hundred thirteen".