12881557991 has 2 divisors, whose sum is σ = 12881557992. Its totient is φ = 12881557990.

The previous prime is 12881557973. The next prime is 12881557993. The reversal of 12881557991 is 19975518821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12881557991 - 2¹⁰ = 12881556967 is a prime.

Together with 12881557993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12881557993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6440778995 + 6440778996.

It is an arithmetic number, because the mean of its divisors is an integer number (6440778996).

Almost surely, 2^12881557991 is an apocalyptic number.

12881557991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12881557991 is an equidigital number, since it uses as much as digits as its factorization.

12881557991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 56.

The spelling of 12881557991 in words is "twelve billion, eight hundred eighty-one million, five hundred fifty-seven thousand, nine hundred ninety-one".