12187347586481 has 2 divisors, whose sum is σ = 12187347586482. Its totient is φ = 12187347586480.

The previous prime is 12187347586471. The next prime is 12187347586489. The reversal of 12187347586481 is 18468574378121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9640900800400 + 2546446786081 = 3104980^2 + 1595759^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12187347586481 is a prime.

It is a super-2 number, since 2×12187347586481² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12187347586489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6093673793240 + 6093673793241.

It is an arithmetic number, because the mean of its divisors is an integer number (6093673793241).

Almost surely, 2^{12187347586481} is an apocalyptic number.

It is an amenable number.

12187347586481 is a deficient number, since it is larger than the sum of its proper divisors (1).

12187347586481 is an equidigital number, since it uses as much as digits as its factorization.

12187347586481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72253440, while the sum is 65.

The spelling of 12187347586481 in words is "twelve trillion, one hundred eighty-seven billion, three hundred forty-seven million, five hundred eighty-six thousand, four hundred eighty-one".