520220661 has 8 divisors (see below), whose sum is σ = 693761184. Its totient is φ = 346746960.

The previous prime is 520220633. The next prime is 520220663. The reversal of 520220661 is 166022025.

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

It is not a de Polignac number, because 520220661 - 2¹⁵ = 520187893 is a prime.

It is a super-2 number, since 2×520220661² = 541259072262553842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520220663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5791 + ... + 32771.

It is an arithmetic number, because the mean of its divisors is an integer number (86720148).

Almost surely, 2^520220661 is an apocalyptic number.

It is an amenable number.

520220661 is a deficient number, since it is larger than the sum of its proper divisors (173540523).

520220661 is a wasteful number, since it uses less digits than its factorization.

520220661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33411.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 520220661 is about 22808.3463012994. The cubic root of 520220661 is about 804.2588814486.

Adding to 520220661 its reverse (166022025), we get a palindrome (686242686).

The spelling of 520220661 in words is "five hundred twenty million, two hundred twenty thousand, six hundred sixty-one".