521243305225 has 6 divisors (see below), whose sum is σ = 646341698510. Its totient is φ = 416994644160.

The previous prime is 521243305171. The next prime is 521243305241. The reversal of 521243305225 is 522503342125.

It can be written as a sum of positive squares in 3 ways, for example, as 20936064249 + 500307240976 = 144693^2 + 707324^2 .

It is not a de Polignac number, because 521243305225 - 2¹⁵ = 521243272457 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10424866080 + ... + 10424866129.

Almost surely, 2^521243305225 is an apocalyptic number.

It is an amenable number.

521243305225 is a deficient number, since it is larger than the sum of its proper divisors (125098393285).

521243305225 is a wasteful number, since it uses less digits than its factorization.

521243305225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20849732219 (or 20849732214 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

The spelling of 521243305225 in words is "five hundred twenty-one billion, two hundred forty-three million, three hundred five thousand, two hundred twenty-five".