111665613 has 8 divisors (see below), whose sum is σ = 149544288. Its totient is φ = 74115344.

The previous prime is 111665611. The next prime is 111665623. The reversal of 111665613 is 316566111.

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

It is a cyclic number.

It is not a de Polignac number, because 111665613 - 2¹ = 111665611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111665611) 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, 81306 + ... + 82667.

It is an arithmetic number, because the mean of its divisors is an integer number (18693036).

Almost surely, 2^111665613 is an apocalyptic number.

It is an amenable number.

111665613 is a deficient number, since it is larger than the sum of its proper divisors (37878675).

111665613 is a wasteful number, since it uses less digits than its factorization.

111665613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164203.

The product of its digits is 3240, while the sum is 30.

The square root of 111665613 is about 10567.1951339984. The cubic root of 111665613 is about 481.5482602007.

The spelling of 111665613 in words is "one hundred eleven million, six hundred sixty-five thousand, six hundred thirteen".