109665505 has 8 divisors (see below), whose sum is σ = 132049512. Its totient is φ = 87431808.

The previous prime is 109665499. The next prime is 109665527. The reversal of 109665505 is 505566901.

It can be written as a sum of positive squares in 4 ways, for example, as 12702096 + 96963409 = 3564^2 + 9847^2 .

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 109665505 - 2⁹ = 109664993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35964 + ... + 38893.

It is an arithmetic number, because the mean of its divisors is an integer number (16506189).

Almost surely, 2^109665505 is an apocalyptic number.

It is an amenable number.

109665505 is a deficient number, since it is larger than the sum of its proper divisors (22384007).

109665505 is an equidigital number, since it uses as much as digits as its factorization.

109665505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75155.

The product of its (nonzero) digits is 40500, while the sum is 37.

The square root of 109665505 is about 10472.1299170704. The cubic root of 109665505 is about 478.6558241087.

It can be divided in two parts, 10966 and 5505, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 109665505 in words is "one hundred nine million, six hundred sixty-five thousand, five hundred five".