11781337583 has 4 divisors (see below), whose sum is σ = 11782048440. Its totient is φ = 11780626728.

The previous prime is 11781337571. The next prime is 11781337597. The reversal of 11781337583 is 38573318711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38573318711 = 19 ⋅2030174669.

It is a cyclic number.

It is not a de Polignac number, because 11781337583 - 2¹⁶ = 11781272047 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 (11781337523) 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, 329960 + ... + 363917.

It is an arithmetic number, because the mean of its divisors is an integer number (2945512110).

Almost surely, 2^11781337583 is an apocalyptic number.

11781337583 is a deficient number, since it is larger than the sum of its proper divisors (710857).

11781337583 is an equidigital number, since it uses as much as digits as its factorization.

11781337583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710856.

The product of its digits is 423360, while the sum is 47.

The spelling of 11781337583 in words is "eleven billion, seven hundred eighty-one million, three hundred thirty-seven thousand, five hundred eighty-three".