82021780448013 has 32 divisors (see below), whose sum is σ = 132365058785280. Its totient is φ = 44103422119680.

The previous prime is 82021780448011. The next prime is 82021780448077. The reversal of 82021780448013 is 31084408712028.

It is not a de Polignac number, because 82021780448013 - 2¹ = 82021780448011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82021780448011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22054353 + ... + 25503686.

It is an arithmetic number, because the mean of its divisors is an integer number (4136408087040).

Almost surely, 2^{82021780448013} is an apocalyptic number.

It is an amenable number.

82021780448013 is a deficient number, since it is larger than the sum of its proper divisors (50343278337267).

82021780448013 is a wasteful number, since it uses less digits than its factorization.

82021780448013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47562897.

The product of its (nonzero) digits is 688128, while the sum is 48.

The spelling of 82021780448013 in words is "eighty-two trillion, twenty-one billion, seven hundred eighty million, four hundred forty-eight thousand, thirteen".