81805062953 has 2 divisors, whose sum is σ = 81805062954. Its totient is φ = 81805062952.

The previous prime is 81805062943. The next prime is 81805063009. The reversal of 81805062953 is 35926050818.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80730993424 + 1074069529 = 284132^2 + 32773^2 .

It is a cyclic number.

It is not a de Polignac number, because 81805062953 - 2²² = 81800868649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81805062898 and 81805062907.

It is not a weakly prime, because it can be changed into another prime (81805062943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40902531476 + 40902531477.

It is an arithmetic number, because the mean of its divisors is an integer number (40902531477).

Almost surely, 2^81805062953 is an apocalyptic number.

It is an amenable number.

81805062953 is a deficient number, since it is larger than the sum of its proper divisors (1).

81805062953 is an equidigital number, since it uses as much as digits as its factorization.

81805062953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 81805062953 in words is "eighty-one billion, eight hundred five million, sixty-two thousand, nine hundred fifty-three".