845838380993 has 4 divisors (see below), whose sum is σ = 847689231300. Its totient is φ = 843987530688.

The previous prime is 845838380969. The next prime is 845838381041. The reversal of 845838380993 is 399083838548.

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 357135321664 + 488703059329 = 597608^2 + 699073^2 .

It is a cyclic number.

It is not a de Polignac number, because 845838380993 - 2²⁴ = 845821603777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (845838380293) 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, 925424468 + ... + 925425381.

It is an arithmetic number, because the mean of its divisors is an integer number (211922307825).

Almost surely, 2^845838380993 is an apocalyptic number.

It is an amenable number.

845838380993 is a deficient number, since it is larger than the sum of its proper divisors (1850850307).

845838380993 is a wasteful number, since it uses less digits than its factorization.

845838380993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850850306.

The product of its (nonzero) digits is 179159040, while the sum is 68.

The spelling of 845838380993 in words is "eight hundred forty-five billion, eight hundred thirty-eight million, three hundred eighty thousand, nine hundred ninety-three".