80531816381 has 2 divisors, whose sum is σ = 80531816382. Its totient is φ = 80531816380.

The previous prime is 80531816359. The next prime is 80531816413. The reversal of 80531816381 is 18361813508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80471505625 + 60310756 = 283675^2 + 7766^2 .

It is a cyclic number.

It is not a de Polignac number, because 80531816381 - 2¹⁸ = 80531554237 is a prime.

It is a super-2 number, since 2×80531816381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80531816311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40265908190 + 40265908191.

It is an arithmetic number, because the mean of its divisors is an integer number (40265908191).

Almost surely, 2^80531816381 is an apocalyptic number.

It is an amenable number.

80531816381 is a deficient number, since it is larger than the sum of its proper divisors (1).

80531816381 is an equidigital number, since it uses as much as digits as its factorization.

80531816381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 80531816381 in words is "eighty billion, five hundred thirty-one million, eight hundred sixteen thousand, three hundred eighty-one".