8343447343681 has 2 divisors, whose sum is σ = 8343447343682. Its totient is φ = 8343447343680.

The previous prime is 8343447343661. The next prime is 8343447343687. The reversal of 8343447343681 is 1863437443438.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6747608883456 + 1595838460225 = 2597616^2 + 1263265^2 .

It is a cyclic number.

It is not a de Polignac number, because 8343447343681 - 2⁹ = 8343447343169 is a prime.

It is a super-2 number, since 2×8343447343681² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8343447343687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4171723671840 + 4171723671841.

It is an arithmetic number, because the mean of its divisors is an integer number (4171723671841).

Almost surely, 2^{8343447343681} is an apocalyptic number.

It is an amenable number.

8343447343681 is a deficient number, since it is larger than the sum of its proper divisors (1).

8343447343681 is an equidigital number, since it uses as much as digits as its factorization.

8343447343681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55738368, while the sum is 58.

The spelling of 8343447343681 in words is "eight trillion, three hundred forty-three billion, four hundred forty-seven million, three hundred forty-three thousand, six hundred eighty-one".