11109581605 has 8 divisors (see below), whose sum is σ = 13656656664. Its totient is φ = 8670892800.

The previous prime is 11109581563. The next prime is 11109581621. The reversal of 11109581605 is 50618590111.

It is a Cunningham number, because it is equal to 105402²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 11109581604 = 1^2 + 105402^2 .

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

It is not a de Polignac number, because 11109581605 - 2⁷ = 11109581477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27096336 + ... + 27096745.

It is an arithmetic number, because the mean of its divisors is an integer number (1707082083).

Almost surely, 2^11109581605 is an apocalyptic number.

It is an amenable number.

11109581605 is a deficient number, since it is larger than the sum of its proper divisors (2547075059).

11109581605 is an equidigital number, since it uses as much as digits as its factorization.

11109581605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54193127.

The product of its (nonzero) digits is 10800, while the sum is 37.

The spelling of 11109581605 in words is "eleven billion, one hundred nine million, five hundred eighty-one thousand, six hundred five".