11813474869549 has 4 divisors (see below), whose sum is σ = 11935263270364. Its totient is φ = 11691686468736.

The previous prime is 11813474869507. The next prime is 11813474869589. The reversal of 11813474869549 is 94596847431811.

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 3630385297449 + 8183089572100 = 1905357^2 + 2860610^2 .

It is a cyclic number.

It is not a de Polignac number, because 11813474869549 - 2⁹ = 11813474869037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11813474869589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60894200262 + ... + 60894200455.

It is an arithmetic number, because the mean of its divisors is an integer number (2983815817591).

Almost surely, 2^{11813474869549} is an apocalyptic number.

It is an amenable number.

11813474869549 is a deficient number, since it is larger than the sum of its proper divisors (121788400815).

11813474869549 is an equidigital number, since it uses as much as digits as its factorization.

11813474869549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121788400814.

The product of its digits is 209018880, while the sum is 70.

The spelling of 11813474869549 in words is "eleven trillion, eight hundred thirteen billion, four hundred seventy-four million, eight hundred sixty-nine thousand, five hundred forty-nine".