806104550450681 has 4 divisors (see below), whose sum is σ = 853522465183092. Its totient is φ = 758686635718272.

The previous prime is 806104550450677. The next prime is 806104550450711. The reversal of 806104550450681 is 186054055401608.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 276826904029456 + 529277646421225 = 16638116^2 + 23006035^2 .

It is a cyclic number.

It is not a de Polignac number, because 806104550450681 - 2² = 806104550450677 is a prime.

It is a super-2 number, since 2×806104550450681² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (806104550450081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23708957366180 + ... + 23708957366213.

It is an arithmetic number, because the mean of its divisors is an integer number (213380616295773).

Almost surely, 2^{806104550450681} is an apocalyptic number.

It is an amenable number.

806104550450681 is a deficient number, since it is larger than the sum of its proper divisors (47417914732411).

806104550450681 is a wasteful number, since it uses less digits than its factorization.

806104550450681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47417914732410.

The product of its (nonzero) digits is 4608000, while the sum is 53.

The spelling of 806104550450681 in words is "eight hundred six trillion, one hundred four billion, five hundred fifty million, four hundred fifty thousand, six hundred eighty-one".