82805329561 has 4 divisors (see below), whose sum is σ = 82887397300. Its totient is φ = 82723261824.

The previous prime is 82805329549. The next prime is 82805329571. The reversal of 82805329561 is 16592350828.

It is a happy number.

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 23064193161 + 59741136400 = 151869^2 + 244420^2 .

It is a cyclic number.

It is not a de Polignac number, because 82805329561 - 2⁹ = 82805329049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82805329511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41032356 + ... + 41034373.

It is an arithmetic number, because the mean of its divisors is an integer number (20721849325).

Almost surely, 2^82805329561 is an apocalyptic number.

It is an amenable number.

82805329561 is a deficient number, since it is larger than the sum of its proper divisors (82067739).

82805329561 is a wasteful number, since it uses less digits than its factorization.

82805329561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82067738.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 82805329561 in words is "eighty-two billion, eight hundred five million, three hundred twenty-nine thousand, five hundred sixty-one".