11605005605 has 4 divisors (see below), whose sum is σ = 13926006732. Its totient is φ = 9284004480.

The previous prime is 11605005583. The next prime is 11605005617. The reversal of 11605005605 is 50650050611.

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 7856872321 + 3748133284 = 88639^2 + 61222^2 .

It is not a de Polignac number, because 11605005605 - 2⁶ = 11605005541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1160500556 + ... + 1160500565.

It is an arithmetic number, because the mean of its divisors is an integer number (3481501683).

Almost surely, 2^11605005605 is an apocalyptic number.

It is an amenable number.

11605005605 is a deficient number, since it is larger than the sum of its proper divisors (2321001127).

11605005605 is an equidigital number, since it uses as much as digits as its factorization.

11605005605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2321001126.

The product of its (nonzero) digits is 4500, while the sum is 29.

The spelling of 11605005605 in words is "eleven billion, six hundred five million, five thousand, six hundred five".