12643419915 has 24 divisors (see below), whose sum is σ = 25046013408. Its totient is φ = 5779848960.

The previous prime is 12643419871. The next prime is 12643419917. The reversal of 12643419915 is 51991434621.

12643419915 is a `hidden beast` number, since 1 + 26 + 434 + 199 + 1 + 5 = 666.

It is not a de Polignac number, because 12643419915 - 2⁷ = 12643419787 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (12643419917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20068606 + ... + 20069235.

It is an arithmetic number, because the mean of its divisors is an integer number (1043583892).

Almost surely, 2^12643419915 is an apocalyptic number.

12643419915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12643419915 is a deficient number, since it is larger than the sum of its proper divisors (12402593493).

12643419915 is a wasteful number, since it uses less digits than its factorization.

12643419915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40137859 (or 40137856 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The spelling of 12643419915 in words is "twelve billion, six hundred forty-three million, four hundred nineteen thousand, nine hundred fifteen".