805728441081 has 4 divisors (see below), whose sum is σ = 1074304588112. Its totient is φ = 537152294052.

The previous prime is 805728441079. The next prime is 805728441149. The reversal of 805728441081 is 180144827508.

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.

It is not a de Polignac number, because 805728441081 - 2¹ = 805728441079 is a prime.

It is a super-2 number, since 2×805728441081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 805728441081.

It is not an unprimeable number, because it can be changed into a prime (805728441041) 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, 134288073511 + ... + 134288073516.

It is an arithmetic number, because the mean of its divisors is an integer number (268576147028).

Almost surely, 2^805728441081 is an apocalyptic number.

It is an amenable number.

805728441081 is a deficient number, since it is larger than the sum of its proper divisors (268576147031).

805728441081 is a wasteful number, since it uses less digits than its factorization.

805728441081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268576147030.

The product of its (nonzero) digits is 573440, while the sum is 48.

The spelling of 805728441081 in words is "eight hundred five billion, seven hundred twenty-eight million, four hundred forty-one thousand, eighty-one".