520685667 has 12 divisors (see below), whose sum is σ = 769592824. Its totient is φ = 339050880.

The previous prime is 520685657. The next prime is 520685681. The reversal of 520685667 is 766586025.

520685667 is a `hidden beast` number, since 5 + 20 + 68 + 566 + 7 = 666.

It is not a de Polignac number, because 520685667 - 2⁴ = 520685651 is a prime.

It is a super-2 number, since 2×520685667² = 542227127638469778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520685657) 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, 672334 + ... + 673107.

Almost surely, 2^520685667 is an apocalyptic number.

520685667 is a deficient number, since it is larger than the sum of its proper divisors (248907157).

520685667 is a wasteful number, since it uses less digits than its factorization.

520685667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345490 (or 1345487 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The square root of 520685667 is about 22818.5377927684. The cubic root of 520685667 is about 804.4984425030.

The spelling of 520685667 in words is "five hundred twenty million, six hundred eighty-five thousand, six hundred sixty-seven".