81996035225 has 12 divisors (see below), whose sum is σ = 109496244396. Its totient is φ = 60550918080.

The previous prime is 81996035167. The next prime is 81996035249. The reversal of 81996035225 is 52253069918.

It can be written as a sum of positive squares in 6 ways, for example, as 6056108041 + 75939927184 = 77821^2 + 275572^2 .

It is not a de Polignac number, because 81996035225 - 2⁸ = 81996034969 is a prime.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 126147422 + ... + 126148071.

It is an arithmetic number, because the mean of its divisors is an integer number (9124687033).

Almost surely, 2^81996035225 is an apocalyptic number.

It is an amenable number.

81996035225 is a deficient number, since it is larger than the sum of its proper divisors (27500209171).

81996035225 is a wasteful number, since it uses less digits than its factorization.

81996035225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252295516 (or 252295511 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 50.

The spelling of 81996035225 in words is "eighty-one billion, nine hundred ninety-six million, thirty-five thousand, two hundred twenty-five".