81907273195 has 32 divisors (see below), whose sum is σ = 107614139904. Its totient is φ = 59352652800.

The previous prime is 81907273183. The next prime is 81907273243. The reversal of 81907273195 is 59137270918.

It is not a de Polignac number, because 81907273195 - 2⁹ = 81907272683 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 (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19356730 + ... + 19360960.

It is an arithmetic number, because the mean of its divisors is an integer number (3362941872).

Almost surely, 2^81907273195 is an apocalyptic number.

81907273195 is a deficient number, since it is larger than the sum of its proper divisors (25706866709).

81907273195 is a wasteful number, since it uses less digits than its factorization.

81907273195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5443.

The product of its (nonzero) digits is 952560, while the sum is 52.

The spelling of 81907273195 in words is "eighty-one billion, nine hundred seven million, two hundred seventy-three thousand, one hundred ninety-five".