12289817818 has 8 divisors (see below), whose sum is σ = 18482117940. Its totient is φ = 6129111840.

The previous prime is 12289817797. The next prime is 12289817819. The reversal of 12289817818 is 81871898221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11214174609 + 1075643209 = 105897^2 + 32797^2 .

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

It is a super-2 number, since 2×12289817818² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12289817819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7897563 + ... + 7899118.

Almost surely, 2^12289817818 is an apocalyptic number.

12289817818 is a deficient number, since it is larger than the sum of its proper divisors (6192300122).

12289817818 is a wasteful number, since it uses less digits than its factorization.

12289817818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15797072.

The product of its digits is 1032192, while the sum is 55.

The spelling of 12289817818 in words is "twelve billion, two hundred eighty-nine million, eight hundred seventeen thousand, eight hundred eighteen".