531666560 has 32 divisors (see below), whose sum is σ = 1271016900. Its totient is φ = 212666368.

The previous prime is 531666503. The next prime is 531666571. The reversal of 531666560 is 65666135.

It can be written as a sum of positive squares in 2 ways, for example, as 491420224 + 40246336 = 22168^2 + 6344^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 414725 + ... + 416004.

Almost surely, 2^531666560 is an apocalyptic number.

It is an amenable number.

531666560 is an abundant number, since it is smaller than the sum of its proper divisors (739350340).

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

531666560 is an equidigital number, since it uses as much as digits as its factorization.

531666560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830748 (or 830736 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 531666560 is about 23057.8958276769. The cubic root of 531666560 is about 810.1145801433.

The spelling of 531666560 in words is "five hundred thirty-one million, six hundred sixty-six thousand, five hundred sixty".