18131911347 has 48 divisors (see below), whose sum is σ = 26863208064. Its totient is φ = 10869830400.

The previous prime is 18131911339. The next prime is 18131911373. The reversal of 18131911347 is 74311913181.

It is not a de Polignac number, because 18131911347 - 2³ = 18131911339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18131911327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28198608 + ... + 28199250.

It is an arithmetic number, because the mean of its divisors is an integer number (559650168).

Almost surely, 2^18131911347 is an apocalyptic number.

18131911347 is a deficient number, since it is larger than the sum of its proper divisors (8731296717).

18131911347 is a wasteful number, since it uses less digits than its factorization.

18131911347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392 (or 1381 counting only the distinct ones).

The product of its digits is 18144, while the sum is 39.

The spelling of 18131911347 in words is "eighteen billion, one hundred thirty-one million, nine hundred eleven thousand, three hundred forty-seven".