81598813033 has 2 divisors, whose sum is σ = 81598813034. Its totient is φ = 81598813032.

The previous prime is 81598812989. The next prime is 81598813039. The reversal of 81598813033 is 33031889518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71929630809 + 9669182224 = 268197^2 + 98332^2 .

It is a cyclic number.

It is not a de Polignac number, because 81598813033 - 2¹⁷ = 81598681961 is a prime.

It is not a weakly prime, because it can be changed into another prime (81598813039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40799406516 + 40799406517.

It is an arithmetic number, because the mean of its divisors is an integer number (40799406517).

Almost surely, 2^81598813033 is an apocalyptic number.

It is an amenable number.

81598813033 is a deficient number, since it is larger than the sum of its proper divisors (1).

81598813033 is an equidigital number, since it uses as much as digits as its factorization.

81598813033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 81598813033 in words is "eighty-one billion, five hundred ninety-eight million, eight hundred thirteen thousand, thirty-three".