13138581861 has 16 divisors (see below), whose sum is σ = 19699081920. Its totient is φ = 8653522320.

The previous prime is 13138581857. The next prime is 13138581899. The reversal of 13138581861 is 16818583131.

13138581861 is a `hidden beast` number, since 1 + 3 + 1 + 3 + 8 + 581 + 8 + 61 = 666.

It is not a de Polignac number, because 13138581861 - 2² = 13138581857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13138581161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2929170 + ... + 2933651.

It is an arithmetic number, because the mean of its divisors is an integer number (1231192620).

Almost surely, 2^13138581861 is an apocalyptic number.

It is an amenable number.

13138581861 is a deficient number, since it is larger than the sum of its proper divisors (6560500059).

13138581861 is an equidigital number, since it uses as much as digits as its factorization.

13138581861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5862913 (or 5862907 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The spelling of 13138581861 in words is "thirteen billion, one hundred thirty-eight million, five hundred eighty-one thousand, eight hundred sixty-one".