523725768721 has 9 divisors (see below), whose sum is σ = 525009109233. Its totient is φ = 522445562880.

The previous prime is 523725768707. The next prime is 523725768733. The reversal of 523725768721 is 127867527325.

It is a happy number.

The square root of 523725768721 is 723689.

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

It can be written as a sum of positive squares in 4 ways, for example, as 244578321 + 523481190400 = 15639^2 + 723520^2 .

It is not a de Polignac number, because 523725768721 - 2¹³ = 523725760529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (523725768701) 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, 463884085 + ... + 463885213.

Almost surely, 2^523725768721 is an apocalyptic number.

523725768721 is the 723689-th square number.

523725768721 is the 361845-th centered octagonal number.

It is an amenable number.

523725768721 is a deficient number, since it is larger than the sum of its proper divisors (1283340512).

523725768721 is an frugal number, since it uses more digits than its factorization.

523725768721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3540 (or 1770 counting only the distinct ones).

The product of its digits is 9878400, while the sum is 55.

The spelling of 523725768721 in words is "five hundred twenty-three billion, seven hundred twenty-five million, seven hundred sixty-eight thousand, seven hundred twenty-one".