12643437155971 has 2 divisors, whose sum is σ = 12643437155972. Its totient is φ = 12643437155970.

The previous prime is 12643437155939. The next prime is 12643437156013. The reversal of 12643437155971 is 17955173434621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12643437155971 - 2⁵ = 12643437155939 is a prime.

It is not a weakly prime, because it can be changed into another prime (12643437155771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6321718577985 + 6321718577986.

It is an arithmetic number, because the mean of its divisors is an integer number (6321718577986).

Almost surely, 2^{12643437155971} is an apocalyptic number.

12643437155971 is a deficient number, since it is larger than the sum of its proper divisors (1).

12643437155971 is an equidigital number, since it uses as much as digits as its factorization.

12643437155971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19051200, while the sum is 58.

The spelling of 12643437155971 in words is "twelve trillion, six hundred forty-three billion, four hundred thirty-seven million, one hundred fifty-five thousand, nine hundred seventy-one".