82517720569 has 2 divisors, whose sum is σ = 82517720570. Its totient is φ = 82517720568.

The previous prime is 82517720567. The next prime is 82517720587. The reversal of 82517720569 is 96502771528.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80190912400 + 2326808169 = 283180^2 + 48237^2 .

It is a cyclic number.

It is not a de Polignac number, because 82517720569 - 2¹ = 82517720567 is a prime.

It is a super-2 number, since 2×82517720569² (a number of 23 digits) contains 22 as substring.

Together with 82517720567, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (82517720567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41258860284 + 41258860285.

It is an arithmetic number, because the mean of its divisors is an integer number (41258860285).

Almost surely, 2^82517720569 is an apocalyptic number.

It is an amenable number.

82517720569 is a deficient number, since it is larger than the sum of its proper divisors (1).

82517720569 is an equidigital number, since it uses as much as digits as its factorization.

82517720569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2116800, while the sum is 52.

The spelling of 82517720569 in words is "eighty-two billion, five hundred seventeen million, seven hundred twenty thousand, five hundred sixty-nine".