81543268343 has 2 divisors, whose sum is σ = 81543268344. Its totient is φ = 81543268342.

The previous prime is 81543268337. The next prime is 81543268361. The reversal of 81543268343 is 34386234518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81543268343 - 2¹² = 81543264247 is a prime.

It is a super-2 number, since 2×81543268343² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81543268643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40771634171 + 40771634172.

It is an arithmetic number, because the mean of its divisors is an integer number (40771634172).

Almost surely, 2^81543268343 is an apocalyptic number.

81543268343 is a deficient number, since it is larger than the sum of its proper divisors (1).

81543268343 is an equidigital number, since it uses as much as digits as its factorization.

81543268343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1658880, while the sum is 47.

The spelling of 81543268343 in words is "eighty-one billion, five hundred forty-three million, two hundred sixty-eight thousand, three hundred forty-three".