81116414157833 has 2 divisors, whose sum is σ = 81116414157834. Its totient is φ = 81116414157832.

The previous prime is 81116414157803. The next prime is 81116414157893. The reversal of 81116414157833 is 33875141461118.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80997336021904 + 119078135929 = 8999852^2 + 345077^2 .

It is a cyclic number.

It is not a de Polignac number, because 81116414157833 - 2⁶ = 81116414157769 is a prime.

It is not a weakly prime, because it can be changed into another prime (81116414157803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40558207078916 + 40558207078917.

It is an arithmetic number, because the mean of its divisors is an integer number (40558207078917).

Almost surely, 2^{81116414157833} is an apocalyptic number.

It is an amenable number.

81116414157833 is a deficient number, since it is larger than the sum of its proper divisors (1).

81116414157833 is an equidigital number, since it uses as much as digits as its factorization.

81116414157833 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 53.

The spelling of 81116414157833 in words is "eighty-one trillion, one hundred sixteen billion, four hundred fourteen million, one hundred fifty-seven thousand, eight hundred thirty-three".