520549263081 has 27 divisors (see below), whose sum is σ = 778820205189. Its totient is φ = 335025788832.

The previous prime is 520549263029. The next prime is 520549263089. The reversal of 520549263081 is 180362945025.

The square root of 520549263081 is 721491.

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

520549263081 is a `hidden beast` number, since 5 + 2 + 0 + 5 + 4 + 9 + 2 + 630 + 8 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 38335682025 + 482213581056 = 195795^2 + 694416^2 .

It is not a de Polignac number, because 520549263081 - 2⁷ = 520549262953 is a prime.

It is a super-2 number, since 2×520549263081² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (520549263089) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 62765571 + ... + 62773863.

Almost surely, 2^520549263081 is an apocalyptic number.

520549263081 is the 721491-st square number.

520549263081 is the 360746-th centered octagonal number.

It is an amenable number.

520549263081 is a deficient number, since it is larger than the sum of its proper divisors (258270942108).

520549263081 is an frugal number, since it uses more digits than its factorization.

520549263081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16650 (or 8325 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 520549263081 in words is "five hundred twenty billion, five hundred forty-nine million, two hundred sixty-three thousand, eighty-one".