82781720570099 has 2 divisors, whose sum is σ = 82781720570100. Its totient is φ = 82781720570098.

The previous prime is 82781720570083. The next prime is 82781720570119. The reversal of 82781720570099 is 99007502718728.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82781720570099 - 2⁴ = 82781720570083 is a prime.

It is not a weakly prime, because it can be changed into another prime (82781720570599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41390860285049 + 41390860285050.

It is an arithmetic number, because the mean of its divisors is an integer number (41390860285050).

Almost surely, 2^{82781720570099} is an apocalyptic number.

82781720570099 is a deficient number, since it is larger than the sum of its proper divisors (1).

82781720570099 is an equidigital number, since it uses as much as digits as its factorization.

82781720570099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35562240, while the sum is 65.

The spelling of 82781720570099 in words is "eighty-two trillion, seven hundred eighty-one billion, seven hundred twenty million, five hundred seventy thousand, ninety-nine".