81944987353 has 8 divisors (see below), whose sum is σ = 82326046208. Its totient is φ = 81564050304.

The previous prime is 81944987309. The next prime is 81944987363. The reversal of 81944987353 is 35378944918.

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

It is a cyclic number.

It is not a de Polignac number, because 81944987353 - 2²⁵ = 81911432921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81944987291 and 81944987300.

It is not an unprimeable number, because it can be changed into a prime (81944987363) 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 in 7 ways as a sum of consecutive naturals, for example, 1494601 + ... + 1548457.

It is an arithmetic number, because the mean of its divisors is an integer number (10290755776).

Almost surely, 2^81944987353 is an apocalyptic number.

It is an amenable number.

81944987353 is a deficient number, since it is larger than the sum of its proper divisors (381058855).

81944987353 is a wasteful number, since it uses less digits than its factorization.

81944987353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60903.

The product of its digits is 26127360, while the sum is 61.

The spelling of 81944987353 in words is "eighty-one billion, nine hundred forty-four million, nine hundred eighty-seven thousand, three hundred fifty-three".