842085478081 has 4 divisors (see below), whose sum is σ = 850422958164. Its totient is φ = 833747998000.

The previous prime is 842085478021. The next prime is 842085478103. The reversal of 842085478081 is 180874580248.

It is a happy number.

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 559264665600 + 282820812481 = 747840^2 + 531809^2 .

It is a cyclic number.

It is not a de Polignac number, because 842085478081 - 2²³ = 842077089473 is a prime.

It is a super-2 number, since 2×842085478081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (842085478021) 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, 4168739890 + ... + 4168740091.

It is an arithmetic number, because the mean of its divisors is an integer number (212605739541).

Almost surely, 2^842085478081 is an apocalyptic number.

It is an amenable number.

842085478081 is a deficient number, since it is larger than the sum of its proper divisors (8337480083).

842085478081 is a wasteful number, since it uses less digits than its factorization.

842085478081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8337480082.

The product of its (nonzero) digits is 4587520, while the sum is 55.

The spelling of 842085478081 in words is "eight hundred forty-two billion, eighty-five million, four hundred seventy-eight thousand, eighty-one".