845368074721 has 9 divisors (see below), whose sum is σ = 851143398483. Its totient is φ = 839631694800.

The previous prime is 845368074673. The next prime is 845368074757. The reversal of 845368074721 is 127470863548.

The square root of 845368074721 is 919439.

It is a perfect power (a square), and thus also a powerful number.

845368074721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 190304465121 + 655063609600 = 436239^2 + 809360^2 .

It is not a de Polignac number, because 845368074721 - 2³⁵ = 811008336353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (845368014721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 138832245 + ... + 138838333.

Almost surely, 2^845368074721 is an apocalyptic number.

845368074721 is the 919439-th square number.

845368074721 is the 459720-th centered octagonal number.

It is an amenable number.

845368074721 is a deficient number, since it is larger than the sum of its proper divisors (5775323762).

845368074721 is an frugal number, since it uses more digits than its factorization.

845368074721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12480 (or 6240 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 55.

The spelling of 845368074721 in words is "eight hundred forty-five billion, three hundred sixty-eight million, seventy-four thousand, seven hundred twenty-one".