1123605804505 has 4 divisors (see below), whose sum is σ = 1348326965412. Its totient is φ = 898884643600.

The previous prime is 1123605804413. The next prime is 1123605804511. The reversal of 1123605804505 is 5054085063211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 386640214416 + 736965590089 = 621804^2 + 858467^2 .

It is not a de Polignac number, because 1123605804505 - 2²¹ = 1123603707353 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112360580446 + ... + 112360580455.

It is an arithmetic number, because the mean of its divisors is an integer number (337081741353).

Almost surely, 2^{1123605804505} is an apocalyptic number.

It is an amenable number.

1123605804505 is a deficient number, since it is larger than the sum of its proper divisors (224721160907).

1123605804505 is an equidigital number, since it uses as much as digits as its factorization.

1123605804505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224721160906.

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 1123605804505 in words is "one trillion, one hundred twenty-three billion, six hundred five million, eight hundred four thousand, five hundred five".