520666025881 has 8 divisors (see below), whose sum is σ = 529236937928. Its totient is φ = 512096256000.

The previous prime is 520666025857. The next prime is 520666025903. The reversal of 520666025881 is 188520666025.

It is the 294581-st star number.

It can be written as a sum of positive squares in 4 ways, for example, as 24317595481 + 496348430400 = 155941^2 + 704520^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 6-Lehmer number, since φ(520666025881) divides (520666025881-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 520666025881 - 2²⁹ = 520129154969 is a prime.

It is a super-2 number, since 2×520666025881² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520666025081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 659191 + ... + 1214851.

It is an arithmetic number, because the mean of its divisors is an integer number (66154617241).

Almost surely, 2^520666025881 is an apocalyptic number.

It is an amenable number.

520666025881 is a deficient number, since it is larger than the sum of its proper divisors (8570912047).

520666025881 is a wasteful number, since it uses less digits than its factorization.

520666025881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571083.

The product of its (nonzero) digits is 1382400, while the sum is 49.

The spelling of 520666025881 in words is "five hundred twenty billion, six hundred sixty-six million, twenty-five thousand, eight hundred eighty-one".