11961736205 has 4 divisors (see below), whose sum is σ = 14354083452. Its totient is φ = 9569388960.

The previous prime is 11961736133. The next prime is 11961736211. The reversal of 11961736205 is 50263716911.

11961736205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50263716911 = 14321 ⋅3509791.

It can be written as a sum of positive squares in 2 ways, for example, as 2319674569 + 9642061636 = 48163^2 + 98194^2 .

It is not a de Polignac number, because 11961736205 - 2⁸ = 11961735949 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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1196173616 + ... + 1196173625.

It is an arithmetic number, because the mean of its divisors is an integer number (3588520863).

Almost surely, 2^11961736205 is an apocalyptic number.

It is an amenable number.

11961736205 is a deficient number, since it is larger than the sum of its proper divisors (2392347247).

11961736205 is an equidigital number, since it uses as much as digits as its factorization.

11961736205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2392347246.

The product of its (nonzero) digits is 68040, while the sum is 41.

The spelling of 11961736205 in words is "eleven billion, nine hundred sixty-one million, seven hundred thirty-six thousand, two hundred five".