520651660 has 24 divisors (see below), whose sum is σ = 1098871200. Its totient is φ = 207212544.

The previous prime is 520651657. The next prime is 520651711. The reversal of 520651660 is 66156025.

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, 61429 + ... + 69388.

It is an arithmetic number, because the mean of its divisors is an integer number (45786300).

Almost surely, 2^520651660 is an apocalyptic number.

It is an amenable number.

520651660 is an abundant number, since it is smaller than the sum of its proper divisors (578219540).

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

520651660 is a wasteful number, since it uses less digits than its factorization.

520651660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131025 (or 131023 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 520651660 is about 22817.7926189191. The cubic root of 520651660 is about 804.4809276657.

The spelling of 520651660 in words is "five hundred twenty million, six hundred fifty-one thousand, six hundred sixty".