82609250821 has 4 divisors (see below), whose sum is σ = 83340306252. Its totient is φ = 81878195392.

The previous prime is 82609250813. The next prime is 82609250837. The reversal of 82609250821 is 12805290628.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1856661921 + 80752588900 = 43089^2 + 284170^2 .

It is a cyclic number.

It is not a de Polignac number, because 82609250821 - 2³ = 82609250813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82609250851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365527546 + ... + 365527771.

It is an arithmetic number, because the mean of its divisors is an integer number (20835076563).

Almost surely, 2^82609250821 is an apocalyptic number.

It is an amenable number.

82609250821 is a deficient number, since it is larger than the sum of its proper divisors (731055431).

82609250821 is a wasteful number, since it uses less digits than its factorization.

82609250821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731055430.

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 82609250821 in words is "eighty-two billion, six hundred nine million, two hundred fifty thousand, eight hundred twenty-one".