66405552 has 20 divisors (see below), whose sum is σ = 171547800. Its totient is φ = 22135168.

The previous prime is 66405539. The next prime is 66405601. The reversal of 66405552 is 25550466.

It is a happy number.

66405552 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 691677 + ... + 691772.

It is an arithmetic number, because the mean of its divisors is an integer number (8577390).

Almost surely, 2^66405552 is an apocalyptic number.

It is an amenable number.

66405552 is an abundant number, since it is smaller than the sum of its proper divisors (105142248).

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

66405552 is a wasteful number, since it uses less digits than its factorization.

66405552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383460 (or 1383454 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 66405552 is about 8148.9601790658. The cubic root of 66405552 is about 404.9500563318.

The spelling of 66405552 in words is "sixty-six million, four hundred five thousand, five hundred fifty-two".