81795943025 has 12 divisors (see below), whose sum is σ = 101440096332. Its totient is φ = 65428285440.

The previous prime is 81795942967. The next prime is 81795943049. The reversal of 81795943025 is 52034959718.

It can be written as a sum of positive squares in 6 ways, for example, as 801059809 + 80994883216 = 28303^2 + 284596^2 .

It is not a de Polignac number, because 81795943025 - 2¹⁶ = 81795877489 is a prime.

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, 10964 + ... + 404613.

It is an arithmetic number, because the mean of its divisors is an integer number (8453341361).

Almost surely, 2^81795943025 is an apocalyptic number.

It is an amenable number.

81795943025 is a deficient number, since it is larger than the sum of its proper divisors (19644153307).

81795943025 is a wasteful number, since it uses less digits than its factorization.

81795943025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423460 (or 423455 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 53.

The spelling of 81795943025 in words is "eighty-one billion, seven hundred ninety-five million, nine hundred forty-three thousand, twenty-five".