81805135341 has 8 divisors (see below), whose sum is σ = 114814225120. Its totient is φ = 51666401232.

The previous prime is 81805135327. The next prime is 81805135393. The reversal of 81805135341 is 14353150818.

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

It is not a de Polignac number, because 81805135341 - 2¹⁵ = 81805102573 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 81805135341.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81805135541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 717588850 + ... + 717588963.

It is an arithmetic number, because the mean of its divisors is an integer number (14351778140).

Almost surely, 2^81805135341 is an apocalyptic number.

It is an amenable number.

81805135341 is a deficient number, since it is larger than the sum of its proper divisors (33009089779).

81805135341 is a wasteful number, since it uses less digits than its factorization.

81805135341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435177835.

The product of its (nonzero) digits is 57600, while the sum is 39.

The spelling of 81805135341 in words is "eighty-one billion, eight hundred five million, one hundred thirty-five thousand, three hundred forty-one".