12544535451491 has 2 divisors, whose sum is σ = 12544535451492. Its totient is φ = 12544535451490.

The previous prime is 12544535451467. The next prime is 12544535451541. The reversal of 12544535451491 is 19415453544521.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12544535451491 is a prime.

It is not a weakly prime, because it can be changed into another prime (12544535451191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6272267725745 + 6272267725746.

It is an arithmetic number, because the mean of its divisors is an integer number (6272267725746).

Almost surely, 2^{12544535451491} is an apocalyptic number.

12544535451491 is a deficient number, since it is larger than the sum of its proper divisors (1).

12544535451491 is an equidigital number, since it uses as much as digits as its factorization.

12544535451491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640000, while the sum is 53.

The spelling of 12544535451491 in words is "twelve trillion, five hundred forty-four billion, five hundred thirty-five million, four hundred fifty-one thousand, four hundred ninety-one".