12443912618 has 4 divisors (see below), whose sum is σ = 18665868930. Its totient is φ = 6221956308.

The previous prime is 12443912539. The next prime is 12443912659. The reversal of 12443912618 is 81621934421.

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., 10201606009 + 2242306609 = 101003^2 + 47353^2 .

It is a super-2 number, since 2×12443912618² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3110978153 + ... + 3110978156.

Almost surely, 2^12443912618 is an apocalyptic number.

12443912618 is a deficient number, since it is larger than the sum of its proper divisors (6221956312).

12443912618 is an equidigital number, since it uses as much as digits as its factorization.

12443912618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6221956311.

The product of its digits is 82944, while the sum is 41.

The spelling of 12443912618 in words is "twelve billion, four hundred forty-three million, nine hundred twelve thousand, six hundred eighteen".