66355564 has 12 divisors (see below), whose sum is σ = 126678888. Its totient is φ = 30161600.

The previous prime is 66355537. The next prime is 66355571. The reversal of 66355564 is 46555366.

It is a happy number.

66355564 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, 753997 + ... + 754084.

It is an arithmetic number, because the mean of its divisors is an integer number (10556574).

Almost surely, 2^66355564 is an apocalyptic number.

It is an amenable number.

66355564 is a deficient number, since it is larger than the sum of its proper divisors (60323324).

66355564 is a wasteful number, since it uses less digits than its factorization.

66355564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508096 (or 1508094 counting only the distinct ones).

The product of its digits is 324000, while the sum is 40.

The square root of 66355564 is about 8145.8924618485. The cubic root of 66355564 is about 404.8484196249.

The spelling of 66355564 in words is "sixty-six million, three hundred fifty-five thousand, five hundred sixty-four".