81273538195 has 8 divisors (see below), whose sum is σ = 97548223680. Its totient is φ = 65005512000.

The previous prime is 81273538189. The next prime is 81273538249. The reversal of 81273538195 is 59183537218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81273538195 - 2¹¹ = 81273536147 is a prime.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1637931 + ... + 1686820.

It is an arithmetic number, because the mean of its divisors is an integer number (12193527960).

Almost surely, 2^81273538195 is an apocalyptic number.

81273538195 is a deficient number, since it is larger than the sum of its proper divisors (16274685485).

81273538195 is a wasteful number, since it uses less digits than its factorization.

81273538195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3329645.

The product of its digits is 1814400, while the sum is 52.

The spelling of 81273538195 in words is "eighty-one billion, two hundred seventy-three million, five hundred thirty-eight thousand, one hundred ninety-five".