81203530769 has 2 divisors, whose sum is σ = 81203530770. Its totient is φ = 81203530768.

The previous prime is 81203530747. The next prime is 81203530801. The reversal of 81203530769 is 96703530218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80715651025 + 487879744 = 284105^2 + 22088^2 .

It is a cyclic number.

It is not a de Polignac number, because 81203530769 - 2²⁴ = 81186753553 is a prime.

It is a super-2 number, since 2×81203530769² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81203536769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40601765384 + 40601765385.

It is an arithmetic number, because the mean of its divisors is an integer number (40601765385).

Almost surely, 2^81203530769 is an apocalyptic number.

It is an amenable number.

81203530769 is a deficient number, since it is larger than the sum of its proper divisors (1).

81203530769 is an equidigital number, since it uses as much as digits as its factorization.

81203530769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 81203530769 in words is "eighty-one billion, two hundred three million, five hundred thirty thousand, seven hundred sixty-nine".