12671257618 has 4 divisors (see below), whose sum is σ = 19006886430. Its totient is φ = 6335628808.

The previous prime is 12671257591. The next prime is 12671257631. The reversal of 12671257618 is 81675217621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11229005089 + 1442252529 = 105967^2 + 37977^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3167814403 + ... + 3167814406.

Almost surely, 2^12671257618 is an apocalyptic number.

12671257618 is a deficient number, since it is larger than the sum of its proper divisors (6335628812).

12671257618 is an equidigital number, since it uses as much as digits as its factorization.

12671257618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6335628811.

The product of its digits is 282240, while the sum is 46.

The spelling of 12671257618 in words is "twelve billion, six hundred seventy-one million, two hundred fifty-seven thousand, six hundred eighteen".