12643816450 has 48 divisors (see below), whose sum is σ = 24585301440. Its totient is φ = 4828704320.

The previous prime is 12643816439. The next prime is 12643816501. The reversal of 12643816450 is 5461834621.

It is a happy number.

It is a super-3 number, since 3×12643816450³ (a number of 31 digits) contains 333 as substring.

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 in 23 ways as a sum of consecutive naturals, for example, 630681 + ... + 650419.

It is an arithmetic number, because the mean of its divisors is an integer number (512193780).

Almost surely, 2^12643816450 is an apocalyptic number.

12643816450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12643816450 is a deficient number, since it is larger than the sum of its proper divisors (11941484990).

12643816450 is a wasteful number, since it uses less digits than its factorization.

12643816450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20331 (or 20326 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 12643816450 in words is "twelve billion, six hundred forty-three million, eight hundred sixteen thousand, four hundred fifty".