12644957419 has 2 divisors, whose sum is σ = 12644957420. Its totient is φ = 12644957418.

The previous prime is 12644957407. The next prime is 12644957461. The reversal of 12644957419 is 91475944621.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12644957419 - 2⁷ = 12644957291 is a prime.

It is a super-2 number, since 2×12644957419² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12644957519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6322478709 + 6322478710.

It is an arithmetic number, because the mean of its divisors is an integer number (6322478710).

Almost surely, 2^12644957419 is an apocalyptic number.

12644957419 is a deficient number, since it is larger than the sum of its proper divisors (1).

12644957419 is an equidigital number, since it uses as much as digits as its factorization.

12644957419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 52.

The spelling of 12644957419 in words is "twelve billion, six hundred forty-four million, nine hundred fifty-seven thousand, four hundred nineteen".