66355660 has 48 divisors (see below), whose sum is σ = 160372800. Its totient is φ = 22590720.

The previous prime is 66355643. The next prime is 66355693. The reversal of 66355660 is 6655366.

It is a happy number.

66355660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66355660² = 8806147228071200, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 19270 + ... + 22450.

It is an arithmetic number, because the mean of its divisors is an integer number (3341100).

Almost surely, 2^66355660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66355660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80186400).

66355660 is an abundant number, since it is smaller than the sum of its proper divisors (94017140).

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

66355660 is a wasteful number, since it uses less digits than its factorization.

66355660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3346 (or 3344 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 37.

The square root of 66355660 is about 8145.8983543867. The cubic root of 66355660 is about 404.8486148631.

The spelling of 66355660 in words is "sixty-six million, three hundred fifty-five thousand, six hundred sixty".