80533802581 has 2 divisors, whose sum is σ = 80533802582. Its totient is φ = 80533802580.

The previous prime is 80533802579. The next prime is 80533802599. The reversal of 80533802581 is 18520833508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66600124900 + 13933677681 = 258070^2 + 118041^2 .

It is a cyclic number.

It is not a de Polignac number, because 80533802581 - 2¹ = 80533802579 is a prime.

It is a super-2 number, since 2×80533802581² (a number of 23 digits) contains 22 as substring.

Together with 80533802579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80533802561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40266901290 + 40266901291.

It is an arithmetic number, because the mean of its divisors is an integer number (40266901291).

Almost surely, 2^80533802581 is an apocalyptic number.

It is an amenable number.

80533802581 is a deficient number, since it is larger than the sum of its proper divisors (1).

80533802581 is an equidigital number, since it uses as much as digits as its factorization.

80533802581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 80533802581 in words is "eighty billion, five hundred thirty-three million, eight hundred two thousand, five hundred eighty-one".