82751778217 has 2 divisors, whose sum is σ = 82751778218. Its totient is φ = 82751778216.

The previous prime is 82751778199. The next prime is 82751778259. The reversal of 82751778217 is 71287715728.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60592776336 + 22159001881 = 246156^2 + 148859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82751778217 is a prime.

It is not a weakly prime, because it can be changed into another prime (82751775217) 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, 41375889108 + 41375889109.

It is an arithmetic number, because the mean of its divisors is an integer number (41375889109).

Almost surely, 2^82751778217 is an apocalyptic number.

It is an amenable number.

82751778217 is a deficient number, since it is larger than the sum of its proper divisors (1).

82751778217 is an equidigital number, since it uses as much as digits as its factorization.

82751778217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3073280, while the sum is 55.

The spelling of 82751778217 in words is "eighty-two billion, seven hundred fifty-one million, seven hundred seventy-eight thousand, two hundred seventeen".