520043006665 has 48 divisors (see below), whose sum is σ = 782617771152. Its totient is φ = 328816889856.

The previous prime is 520043006663. The next prime is 520043006671. The reversal of 520043006665 is 566600340025.

It can be written as a sum of positive squares in 8 ways, for example, as 91196148169 + 428846858496 = 301987^2 + 654864^2 .

It is not a de Polignac number, because 520043006665 - 2¹ = 520043006663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (520043006663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2897217 + ... + 3071473.

It is an arithmetic number, because the mean of its divisors is an integer number (16304536899).

Almost surely, 2^520043006665 is an apocalyptic number.

It is an amenable number.

520043006665 is a deficient number, since it is larger than the sum of its proper divisors (262574764487).

520043006665 is a wasteful number, since it uses less digits than its factorization.

520043006665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175226 (or 175219 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 37.

The spelling of 520043006665 in words is "five hundred twenty billion, forty-three million, six thousand, six hundred sixty-five".