521011660 has 48 divisors (see below), whose sum is σ = 1179988992. Its totient is φ = 192096000.

The previous prime is 521011649. The next prime is 521011669. The reversal of 521011660 is 66110125.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (521011669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298390 + ... + 300130.

It is an arithmetic number, because the mean of its divisors is an integer number (24583104).

Almost surely, 2^521011660 is an apocalyptic number.

It is an amenable number.

521011660 is an abundant number, since it is smaller than the sum of its proper divisors (658977332).

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

521011660 is a wasteful number, since it uses less digits than its factorization.

521011660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2914 (or 2912 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 521011660 is about 22825.6798365350. The cubic root of 521011660 is about 804.6663020287. Note that the first 3 decimals are identical.

Adding to 521011660 its reverse (66110125), we get a palindrome (587121785).

The spelling of 521011660 in words is "five hundred twenty-one million, eleven thousand, six hundred sixty".