1165605505 has 4 divisors (see below), whose sum is σ = 1398726612. Its totient is φ = 932484400.

The previous prime is 1165605491. The next prime is 1165605517. The reversal of 1165605505 is 5055065611.

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 624950001 + 540655504 = 24999^2 + 23252^2 .

It is not a de Polignac number, because 1165605505 - 2⁵ = 1165605473 is a prime.

It is a Duffinian 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, 116560546 + ... + 116560555.

It is an arithmetic number, because the mean of its divisors is an integer number (349681653).

Almost surely, 2^1165605505 is an apocalyptic number.

It is an amenable number.

1165605505 is a deficient number, since it is larger than the sum of its proper divisors (233121107).

1165605505 is an equidigital number, since it uses as much as digits as its factorization.

1165605505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233121106.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 1165605505 is about 34140.9652031105. The cubic root of 1165605505 is about 1052.4073276149.

The spelling of 1165605505 in words is "one billion, one hundred sixty-five million, six hundred five thousand, five hundred five".