82079477681 has 2 divisors, whose sum is σ = 82079477682. Its totient is φ = 82079477680.

The previous prime is 82079477659. The next prime is 82079477801. The reversal of 82079477681 is 18677497028.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49900858225 + 32178619456 = 223385^2 + 179384^2 .

It is a cyclic number.

It is not a de Polignac number, because 82079477681 - 2¹⁴ = 82079461297 is a prime.

It is a super-2 number, since 2×82079477681² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 82079477681.

It is not a weakly prime, because it can be changed into another prime (82079477611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41039738840 + 41039738841.

It is an arithmetic number, because the mean of its divisors is an integer number (41039738841).

Almost surely, 2^82079477681 is an apocalyptic number.

It is an amenable number.

82079477681 is a deficient number, since it is larger than the sum of its proper divisors (1).

82079477681 is an equidigital number, since it uses as much as digits as its factorization.

82079477681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9483264, while the sum is 59.

The spelling of 82079477681 in words is "eighty-two billion, seventy-nine million, four hundred seventy-seven thousand, six hundred eighty-one".