845503373921 has 8 divisors (see below), whose sum is σ = 850218133800. Its totient is φ = 840792056832.

The previous prime is 845503373909. The next prime is 845503374041. The reversal of 845503373921 is 129373305548.

It can be written as a sum of positive squares in 4 ways, for example, as 456825940321 + 388677433600 = 675889^2 + 623440^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 845503373921 - 2¹⁰ = 845503372897 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 845503373921.

It is not an unprimeable number, because it can be changed into a prime (845503373021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 367370 + ... + 1351283.

It is an arithmetic number, because the mean of its divisors is an integer number (106277266725).

Almost surely, 2^845503373921 is an apocalyptic number.

It is an amenable number.

845503373921 is a deficient number, since it is larger than the sum of its proper divisors (4714759879).

845503373921 is a wasteful number, since it uses less digits than its factorization.

845503373921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721395.

The product of its (nonzero) digits is 2721600, while the sum is 50.

The spelling of 845503373921 in words is "eight hundred forty-five billion, five hundred three million, three hundred seventy-three thousand, nine hundred twenty-one".