82212215257 has 6 divisors (see below), whose sum is σ = 82461447978. Its totient is φ = 81963014112.

The previous prime is 82212215251. The next prime is 82212215291. The reversal of 82212215257 is 75251221228.

It can be written as a sum of positive squares in only one way, i.e., 62452009216 + 19760206041 = 249904^2 + 140571^2 .

It is a de Polignac number, because none of the positive numbers 2^k-82212215257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82212215251) 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 in 5 ways as a sum of consecutive naturals, for example, 5255794 + ... + 5271412.

It is an arithmetic number, because the mean of its divisors is an integer number (13743574663).

Almost surely, 2^82212215257 is an apocalyptic number.

It is an amenable number.

82212215257 is a deficient number, since it is larger than the sum of its proper divisors (249232721).

82212215257 is an frugal number, since it uses more digits than its factorization.

82212215257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31575 (or 15956 counting only the distinct ones).

The product of its digits is 44800, while the sum is 37.

The spelling of 82212215257 in words is "eighty-two billion, two hundred twelve million, two hundred fifteen thousand, two hundred fifty-seven".