520075665 has 12 divisors (see below), whose sum is σ = 901464564. Its totient is φ = 277373664.

The previous prime is 520075631. The next prime is 520075667. The reversal of 520075665 is 566570025.

520075665 is a `hidden beast` number, since 520 + 0 + 75 + 6 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 57653649 + 462422016 = 7593^2 + 21504^2 .

It is not a de Polignac number, because 520075665 - 2⁶ = 520075601 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (520075667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5778574 + ... + 5778663.

It is an arithmetic number, because the mean of its divisors is an integer number (75122047).

Almost surely, 2^520075665 is an apocalyptic number.

It is an amenable number.

520075665 is a deficient number, since it is larger than the sum of its proper divisors (381388899).

520075665 is a wasteful number, since it uses less digits than its factorization.

520075665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11557248 (or 11557245 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The square root of 520075665 is about 22805.1675065104. The cubic root of 520075665 is about 804.1841534434.

The spelling of 520075665 in words is "five hundred twenty million, seventy-five thousand, six hundred sixty-five".