845723135437 has 4 divisors (see below), whose sum is σ = 847130329276. Its totient is φ = 844315941600.

The previous prime is 845723135363. The next prime is 845723135473. The reversal of 845723135437 is 734531327548.

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 777692933161 + 68030202276 = 881869^2 + 260826^2 .

It is a cyclic number.

It is not a de Polignac number, because 845723135437 - 2¹¹ = 845723133389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845723135137) 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, 703596018 + ... + 703597219.

It is an arithmetic number, because the mean of its divisors is an integer number (211782582319).

Almost surely, 2^845723135437 is an apocalyptic number.

It is an amenable number.

845723135437 is a deficient number, since it is larger than the sum of its proper divisors (1407193839).

845723135437 is a wasteful number, since it uses less digits than its factorization.

845723135437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407193838.

The product of its digits is 8467200, while the sum is 52.

The spelling of 845723135437 in words is "eight hundred forty-five billion, seven hundred twenty-three million, one hundred thirty-five thousand, four hundred thirty-seven".