11775655205 has 4 divisors (see below), whose sum is σ = 14130786252. Its totient is φ = 9420524160.

The previous prime is 11775655163. The next prime is 11775655273. The reversal of 11775655205 is 50255657711.

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 4030599169 + 7745056036 = 63487^2 + 88006^2 .

It is not a de Polignac number, because 11775655205 - 2⁸ = 11775654949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1177565516 + ... + 1177565525.

It is an arithmetic number, because the mean of its divisors is an integer number (3532696563).

Almost surely, 2^11775655205 is an apocalyptic number.

It is an amenable number.

11775655205 is a deficient number, since it is larger than the sum of its proper divisors (2355131047).

11775655205 is an equidigital number, since it uses as much as digits as its factorization.

11775655205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355131046.

The product of its (nonzero) digits is 367500, while the sum is 44.

The spelling of 11775655205 in words is "eleven billion, seven hundred seventy-five million, six hundred fifty-five thousand, two hundred five".