12918496538 has 8 divisors (see below), whose sum is σ = 19643193588. Its totient is φ = 6370765344.

The previous prime is 12918496523. The next prime is 12918496541. The reversal of 12918496538 is 83569481921.

It can be written as a sum of positive squares in 2 ways, for example, as 12698359969 + 220136569 = 112687^2 + 14837^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44241281 + ... + 44241572.

Almost surely, 2^12918496538 is an apocalyptic number.

12918496538 is a deficient number, since it is larger than the sum of its proper divisors (6724697050).

12918496538 is an equidigital number, since it uses as much as digits as its factorization.

12918496538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88482928.

The product of its digits is 3732480, while the sum is 56.

The spelling of 12918496538 in words is "twelve billion, nine hundred eighteen million, four hundred ninety-six thousand, five hundred thirty-eight".