81033079997 has 2 divisors, whose sum is σ = 81033079998. Its totient is φ = 81033079996.

The previous prime is 81033079949. The next prime is 81033080033. The reversal of 81033079997 is 79997033018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74169620281 + 6863459716 = 272341^2 + 82846^2 .

It is a cyclic number.

It is not a de Polignac number, because 81033079997 - 2¹² = 81033075901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81033079927) 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, 40516539998 + 40516539999.

It is an arithmetic number, because the mean of its divisors is an integer number (40516539999).

Almost surely, 2^81033079997 is an apocalyptic number.

It is an amenable number.

81033079997 is a deficient number, since it is larger than the sum of its proper divisors (1).

81033079997 is an equidigital number, since it uses as much as digits as its factorization.

81033079997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2571912, while the sum is 56.

The spelling of 81033079997 in words is "eighty-one billion, thirty-three million, seventy-nine thousand, nine hundred ninety-seven".