81417388043 has 2 divisors, whose sum is σ = 81417388044. Its totient is φ = 81417388042.

The previous prime is 81417388021. The next prime is 81417388061. The reversal of 81417388043 is 34088371418.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81417388043 - 2⁶ = 81417387979 is a prime.

It is not a weakly prime, because it can be changed into another prime (81417388643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40708694021 + 40708694022.

It is an arithmetic number, because the mean of its divisors is an integer number (40708694022).

Almost surely, 2^81417388043 is an apocalyptic number.

81417388043 is a deficient number, since it is larger than the sum of its proper divisors (1).

81417388043 is an equidigital number, since it uses as much as digits as its factorization.

81417388043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 516096, while the sum is 47.

The spelling of 81417388043 in words is "eighty-one billion, four hundred seventeen million, three hundred eighty-eight thousand, forty-three".