81016814803 has 2 divisors, whose sum is σ = 81016814804. Its totient is φ = 81016814802.

The previous prime is 81016814789. The next prime is 81016814831. The reversal of 81016814803 is 30841861018.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81016814803 is a prime.

It is not a weakly prime, because it can be changed into another prime (81016814833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40508407401 + 40508407402.

It is an arithmetic number, because the mean of its divisors is an integer number (40508407402).

Almost surely, 2^81016814803 is an apocalyptic number.

81016814803 is a deficient number, since it is larger than the sum of its proper divisors (1).

81016814803 is an equidigital number, since it uses as much as digits as its factorization.

81016814803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 40.

The spelling of 81016814803 in words is "eighty-one billion, sixteen million, eight hundred fourteen thousand, eight hundred three".