111666605 has 4 divisors (see below), whose sum is σ = 133999932. Its totient is φ = 89333280.

The previous prime is 111666593. The next prime is 111666613. The reversal of 111666605 is 506666111.

111666605 = 6100² + 6101² + 6102².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506666111 = 7 ⋅72380873.

It can be written as a sum of positive squares in 2 ways, for example, as 72965764 + 38700841 = 8542^2 + 6221^2 .

It is not a de Polignac number, because 111666605 - 2⁴ = 111666589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 11166656 + ... + 11166665.

It is an arithmetic number, because the mean of its divisors is an integer number (33499983).

Almost surely, 2^111666605 is an apocalyptic number.

It is an amenable number.

111666605 is a deficient number, since it is larger than the sum of its proper divisors (22333327).

111666605 is an equidigital number, since it uses as much as digits as its factorization.

111666605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22333326.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 111666605 is about 10567.2420716098. The cubic root of 111666605 is about 481.5496861678.

It can be divided in two parts, 11166 and 6605, that added together give a palindrome (17771).

The spelling of 111666605 in words is "one hundred eleven million, six hundred sixty-six thousand, six hundred five".