12446778909 has 8 divisors (see below), whose sum is σ = 16601537632. Its totient is φ = 8294936400.

The previous prime is 12446778899. The next prime is 12446778919. The reversal of 12446778909 is 90987764421.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12446778899) and next prime (12446778919).

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

It is not a de Polignac number, because 12446778909 - 2⁸ = 12446778653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12446778919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 719074 + ... + 736179.

It is an arithmetic number, because the mean of its divisors is an integer number (2075192204).

Almost surely, 2^12446778909 is an apocalyptic number.

It is an amenable number.

12446778909 is a deficient number, since it is larger than the sum of its proper divisors (4154758723).

12446778909 is a wasteful number, since it uses less digits than its factorization.

12446778909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458107.

The product of its (nonzero) digits is 6096384, while the sum is 57.

The spelling of 12446778909 in words is "twelve billion, four hundred forty-six million, seven hundred seventy-eight thousand, nine hundred nine".