12491366443 has 2 divisors, whose sum is σ = 12491366444. Its totient is φ = 12491366442.

The previous prime is 12491366411. The next prime is 12491366449. The reversal of 12491366443 is 34466319421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12491366443 - 2⁵ = 12491366411 is a prime.

It is a super-2 number, since 2×12491366443² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12491366443.

It is not a weakly prime, because it can be changed into another prime (12491366449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6245683221 + 6245683222.

It is an arithmetic number, because the mean of its divisors is an integer number (6245683222).

Almost surely, 2^12491366443 is an apocalyptic number.

12491366443 is a deficient number, since it is larger than the sum of its proper divisors (1).

12491366443 is an equidigital number, since it uses as much as digits as its factorization.

12491366443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 43.

The spelling of 12491366443 in words is "twelve billion, four hundred ninety-one million, three hundred sixty-six thousand, four hundred forty-three".