81920340143 has 2 divisors, whose sum is σ = 81920340144. Its totient is φ = 81920340142.

The previous prime is 81920340121. The next prime is 81920340211. The reversal of 81920340143 is 34104302918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81920340143 - 2⁶ = 81920340079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81920340113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40960170071 + 40960170072.

It is an arithmetic number, because the mean of its divisors is an integer number (40960170072).

Almost surely, 2^81920340143 is an apocalyptic number.

81920340143 is a deficient number, since it is larger than the sum of its proper divisors (1).

81920340143 is an equidigital number, since it uses as much as digits as its factorization.

81920340143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 81920340143 in words is "eighty-one billion, nine hundred twenty million, three hundred forty thousand, one hundred forty-three".