520663855 has 8 divisors (see below), whose sum is σ = 628935264. Its totient is φ = 413772000.

The previous prime is 520663763. The next prime is 520663921. The reversal of 520663855 is 558366025.

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

It is not a de Polignac number, because 520663855 - 2⁹ = 520663343 is a prime.

It is a super-2 number, since 2×520663855² = 542181699806922050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent 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, 344056 + ... + 345565.

It is an arithmetic number, because the mean of its divisors is an integer number (78616908).

Almost surely, 2^520663855 is an apocalyptic number.

520663855 is a deficient number, since it is larger than the sum of its proper divisors (108271409).

520663855 is a wasteful number, since it uses less digits than its factorization.

520663855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689777.

The product of its (nonzero) digits is 216000, while the sum is 40.

The square root of 520663855 is about 22818.0598430278. The cubic root of 520663855 is about 804.4872086203.

The spelling of 520663855 in words is "five hundred twenty million, six hundred sixty-three thousand, eight hundred fifty-five".