82581215293 has 2 divisors, whose sum is σ = 82581215294. Its totient is φ = 82581215292.

The previous prime is 82581215263. The next prime is 82581215309. The reversal of 82581215293 is 39251218528.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56120662404 + 26460552889 = 236898^2 + 162667^2 .

It is a cyclic number.

It is not a de Polignac number, because 82581215293 - 2¹³ = 82581207101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82581215263) 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, 41290607646 + 41290607647.

It is an arithmetic number, because the mean of its divisors is an integer number (41290607647).

Almost surely, 2^82581215293 is an apocalyptic number.

It is an amenable number.

82581215293 is a deficient number, since it is larger than the sum of its proper divisors (1).

82581215293 is an equidigital number, since it uses as much as digits as its factorization.

82581215293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345600, while the sum is 46.

The spelling of 82581215293 in words is "eighty-two billion, five hundred eighty-one million, two hundred fifteen thousand, two hundred ninety-three".