66205564 has 6 divisors (see below), whose sum is σ = 115859744. Its totient is φ = 33102780.

The previous prime is 66205541. The next prime is 66205591. The reversal of 66205564 is 46550266.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8275692 + ... + 8275699.

Almost surely, 2^66205564 is an apocalyptic number.

It is an amenable number.

66205564 is a deficient number, since it is larger than the sum of its proper divisors (49654180).

66205564 is a wasteful number, since it uses less digits than its factorization.

66205564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16551395 (or 16551393 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 66205564 is about 8136.6801583938. The cubic root of 66205564 is about 404.5431295792.

The spelling of 66205564 in words is "sixty-six million, two hundred five thousand, five hundred sixty-four".