52521666 has 16 divisors (see below), whose sum is σ = 105153024. Its totient is φ = 17488944.

The previous prime is 52521647. The next prime is 52521683. The reversal of 52521666 is 66612525.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2496 + ... + 10548.

It is an arithmetic number, because the mean of its divisors is an integer number (6572064).

Almost surely, 2^52521666 is an apocalyptic number.

52521666 is an abundant number, since it is smaller than the sum of its proper divisors (52631358).

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

52521666 is a wasteful number, since it uses less digits than its factorization.

52521666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9145.

The product of its digits is 21600, while the sum is 33.

The square root of 52521666 is about 7247.1833149162. The cubic root of 52521666 is about 374.4951214544.

The spelling of 52521666 in words is "fifty-two million, five hundred twenty-one thousand, six hundred sixty-six".