12731222618 has 8 divisors (see below), whose sum is σ = 19111792212. Its totient is φ = 6360625216.

The previous prime is 12731222611. The next prime is 12731222629. The reversal of 12731222618 is 81622213721.

It can be written as a sum of positive squares in 2 ways, for example, as 12558115969 + 173106649 = 112063^2 + 13157^2 .

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

It is not an unprimeable number, because it can be changed into a prime (12731222611) 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 3 ways as a sum of consecutive naturals, for example, 2489855 + ... + 2494962.

Almost surely, 2^12731222618 is an apocalyptic number.

12731222618 is a deficient number, since it is larger than the sum of its proper divisors (6380569594).

12731222618 is a wasteful number, since it uses less digits than its factorization.

12731222618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4986096.

The product of its digits is 16128, while the sum is 35.

The spelling of 12731222618 in words is "twelve billion, seven hundred thirty-one million, two hundred twenty-two thousand, six hundred eighteen".