11813138511 has 8 divisors (see below), whose sum is σ = 15751370544. Its totient is φ = 7875166080.

The previous prime is 11813138503. The next prime is 11813138539. The reversal of 11813138511 is 11583131811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11813138511 - 2³ = 11813138503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11813138581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104295 + ... + 185751.

It is an arithmetic number, because the mean of its divisors is an integer number (1968921318).

Almost surely, 2^11813138511 is an apocalyptic number.

11813138511 is a deficient number, since it is larger than the sum of its proper divisors (3938232033).

11813138511 is an equidigital number, since it uses as much as digits as its factorization.

11813138511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129801.

The product of its digits is 2880, while the sum is 33.

The spelling of 11813138511 in words is "eleven billion, eight hundred thirteen million, one hundred thirty-eight thousand, five hundred eleven".