81592838773 has 2 divisors, whose sum is σ = 81592838774. Its totient is φ = 81592838772.

The previous prime is 81592838771. The next prime is 81592838827. The reversal of 81592838773 is 37783829518.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81534804849 + 58033924 = 285543^2 + 7618^2 .

It is a cyclic number.

It is not a de Polignac number, because 81592838773 - 2¹ = 81592838771 is a prime.

Together with 81592838771, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81592838771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40796419386 + 40796419387.

It is an arithmetic number, because the mean of its divisors is an integer number (40796419387).

Almost surely, 2^81592838773 is an apocalyptic number.

It is an amenable number.

81592838773 is a deficient number, since it is larger than the sum of its proper divisors (1).

81592838773 is an equidigital number, since it uses as much as digits as its factorization.

81592838773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20321280, while the sum is 61.

The spelling of 81592838773 in words is "eighty-one billion, five hundred ninety-two million, eight hundred thirty-eight thousand, seven hundred seventy-three".