11838774509 has 4 divisors (see below), whose sum is σ = 12015472704. Its totient is φ = 11662076316.

The previous prime is 11838774473. The next prime is 11838774511. The reversal of 11838774509 is 90547783811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11838774509 - 2²⁴ = 11821997293 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 (11838774529) 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, 88348997 + ... + 88349130.

It is an arithmetic number, because the mean of its divisors is an integer number (3003868176).

Almost surely, 2^11838774509 is an apocalyptic number.

It is an amenable number.

11838774509 is a deficient number, since it is larger than the sum of its proper divisors (176698195).

11838774509 is an equidigital number, since it uses as much as digits as its factorization.

11838774509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176698194.

The product of its (nonzero) digits is 1693440, while the sum is 53.

The spelling of 11838774509 in words is "eleven billion, eight hundred thirty-eight million, seven hundred seventy-four thousand, five hundred nine".