520012661 has 16 divisors (see below), whose sum is σ = 604571136. Its totient is φ = 438053616.

The previous prime is 520012639. The next prime is 520012697. The reversal of 520012661 is 166210025.

It is not a de Polignac number, because 520012661 - 2¹⁰ = 520011637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520012261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255530 + ... + 257556.

It is an arithmetic number, because the mean of its divisors is an integer number (37785696).

Almost surely, 2^520012661 is an apocalyptic number.

It is an amenable number.

520012661 is a deficient number, since it is larger than the sum of its proper divisors (84558475).

520012661 is a wasteful number, since it uses less digits than its factorization.

520012661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2648.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 520012661 is about 22803.7861110825. The cubic root of 520012661 is about 804.1516781275.

Adding to 520012661 its reverse (166210025), we get a palindrome (686222686).

The spelling of 520012661 in words is "five hundred twenty million, twelve thousand, six hundred sixty-one".