11781381047393 has 4 divisors (see below), whose sum is σ = 11781425336340. Its totient is φ = 11781336758448.

The previous prime is 11781381047389. The next prime is 11781381047431. The reversal of 11781381047393 is 39374018318711.

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 8970336482704 + 2811044564689 = 2995052^2 + 1676617^2 .

It is a cyclic number.

It is not a de Polignac number, because 11781381047393 - 2² = 11781381047389 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11781381047353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21743030 + ... + 22278287.

It is an arithmetic number, because the mean of its divisors is an integer number (2945356334085).

Almost surely, 2^{11781381047393} is an apocalyptic number.

It is an amenable number.

11781381047393 is a deficient number, since it is larger than the sum of its proper divisors (44288947).

11781381047393 is an equidigital number, since it uses as much as digits as its factorization.

11781381047393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44288946.

The product of its (nonzero) digits is 3048192, while the sum is 56.

The spelling of 11781381047393 in words is "eleven trillion, seven hundred eighty-one billion, three hundred eighty-one million, forty-seven thousand, three hundred ninety-three".