82665217 has 2 divisors, whose sum is σ = 82665218. Its totient is φ = 82665216.

The previous prime is 82665211. The next prime is 82665227. The reversal of 82665217 is 71256628.

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., 68707521 + 13957696 = 8289^2 + 3736^2 .

It is a cyclic number.

It is not a de Polignac number, because 82665217 - 2¹⁵ = 82632449 is a prime.

It is not a weakly prime, because it can be changed into another prime (82665211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41332608 + 41332609.

It is an arithmetic number, because the mean of its divisors is an integer number (41332609).

Almost surely, 2^82665217 is an apocalyptic number.

It is an amenable number.

82665217 is a deficient number, since it is larger than the sum of its proper divisors (1).

82665217 is an equidigital number, since it uses as much as digits as its factorization.

82665217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 82665217 is about 9092.0414099365. The cubic root of 82665217 is about 435.6197920577.

The spelling of 82665217 in words is "eighty-two million, six hundred sixty-five thousand, two hundred seventeen".