80821050689 has 4 divisors (see below), whose sum is σ = 80849581956. Its totient is φ = 80792519424.

The previous prime is 80821050683. The next prime is 80821050697. The reversal of 80821050689 is 98605012808.

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 54449889025 + 26371161664 = 233345^2 + 162392^2 .

It is a cyclic number.

It is not a de Polignac number, because 80821050689 - 2¹⁶ = 80820985153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80821050683) 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, 14261384 + ... + 14267049.

It is an arithmetic number, because the mean of its divisors is an integer number (20212395489).

Almost surely, 2^80821050689 is an apocalyptic number.

It is an amenable number.

80821050689 is a deficient number, since it is larger than the sum of its proper divisors (28531267).

80821050689 is a wasteful number, since it uses less digits than its factorization.

80821050689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28531266.

The product of its (nonzero) digits is 276480, while the sum is 47.

The spelling of 80821050689 in words is "eighty billion, eight hundred twenty-one million, fifty thousand, six hundred eighty-nine".