81074295473 has 2 divisors, whose sum is σ = 81074295474. Its totient is φ = 81074295472.

The previous prime is 81074295457. The next prime is 81074295479. The reversal of 81074295473 is 37459247018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48121880689 + 32952414784 = 219367^2 + 181528^2 .

It is a cyclic number.

It is not a de Polignac number, because 81074295473 - 2⁴ = 81074295457 is a prime.

It is not a weakly prime, because it can be changed into another prime (81074295479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40537147736 + 40537147737.

It is an arithmetic number, because the mean of its divisors is an integer number (40537147737).

Almost surely, 2^81074295473 is an apocalyptic number.

It is an amenable number.

81074295473 is a deficient number, since it is larger than the sum of its proper divisors (1).

81074295473 is an equidigital number, since it uses as much as digits as its factorization.

81074295473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 81074295473 in words is "eighty-one billion, seventy-four million, two hundred ninety-five thousand, four hundred seventy-three".