80640332998821 has 6 divisors (see below), whose sum is σ = 116480480998310. Its totient is φ = 53760221999208.

The previous prime is 80640332998801. The next prime is 80640332998829. The reversal of 80640332998821 is 12889923304608.

80640332998821 is a `hidden beast` number, since 80 + 6 + 40 + 332 + 99 + 88 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 58165622436321 + 22474710562500 = 7626639^2 + 4740750^2 .

It is not a de Polignac number, because 80640332998821 - 2¹³ = 80640332990629 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 (80640332998829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4480018499926 + ... + 4480018499943.

Almost surely, 2^{80640332998821} is an apocalyptic number.

It is an amenable number.

80640332998821 is a deficient number, since it is larger than the sum of its proper divisors (35840147999489).

80640332998821 is a wasteful number, since it uses less digits than its factorization.

80640332998821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8960036999875 (or 8960036999872 counting only the distinct ones).

The product of its (nonzero) digits is 35831808, while the sum is 63.

The spelling of 80640332998821 in words is "eighty trillion, six hundred forty billion, three hundred thirty-two million, nine hundred ninety-eight thousand, eight hundred twenty-one".