18516136713 has 4 divisors (see below), whose sum is σ = 24688182288. Its totient is φ = 12344091140.

The previous prime is 18516136711. The next prime is 18516136739. The reversal of 18516136713 is 31763161581.

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 18516136713 - 2¹ = 18516136711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18516136711) 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 3 ways as a sum of consecutive naturals, for example, 3086022783 + ... + 3086022788.

It is an arithmetic number, because the mean of its divisors is an integer number (6172045572).

Almost surely, 2^18516136713 is an apocalyptic number.

It is an amenable number.

18516136713 is a deficient number, since it is larger than the sum of its proper divisors (6172045575).

18516136713 is an equidigital number, since it uses as much as digits as its factorization.

18516136713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6172045574.

The product of its digits is 90720, while the sum is 42.

The spelling of 18516136713 in words is "eighteen billion, five hundred sixteen million, one hundred thirty-six thousand, seven hundred thirteen".