81065163353 has 4 divisors (see below), whose sum is σ = 81072700368. Its totient is φ = 81057626340.

The previous prime is 81065163331. The next prime is 81065163373. The reversal of 81065163353 is 35336156018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35336156018 = 2 ⋅17668078009.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81065163353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81065163353.

It is not an unprimeable number, because it can be changed into a prime (81065163313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3752351 + ... + 3773892.

It is an arithmetic number, because the mean of its divisors is an integer number (20268175092).

Almost surely, 2^81065163353 is an apocalyptic number.

It is an amenable number.

81065163353 is a deficient number, since it is larger than the sum of its proper divisors (7537015).

81065163353 is a wasteful number, since it uses less digits than its factorization.

81065163353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7537014.

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 81065163353 in words is "eighty-one billion, sixty-five million, one hundred sixty-three thousand, three hundred fifty-three".