520663866 has 16 divisors (see below), whose sum is σ = 1065545184. Its totient is φ = 169518384.

The previous prime is 520663763. The next prime is 520663921. The reversal of 520663866 is 668366025.

It is a super-2 number, since 2×520663866² = 542181722716131912, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1008781 + ... + 1009296.

It is an arithmetic number, because the mean of its divisors is an integer number (66596574).

Almost surely, 2^520663866 is an apocalyptic number.

520663866 is an abundant number, since it is smaller than the sum of its proper divisors (544881318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

520663866 is a wasteful number, since it uses less digits than its factorization.

520663866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2018125.

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 520663866 is about 22818.0600840650. The cubic root of 520663866 is about 804.4872142857.

The spelling of 520663866 in words is "five hundred twenty million, six hundred sixty-three thousand, eight hundred sixty-six".