66563804 has 6 divisors (see below), whose sum is σ = 116486664. Its totient is φ = 33281900.

The previous prime is 66563773. The next prime is 66563807. The reversal of 66563804 is 40836566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66563807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8320472 + ... + 8320479.

It is an arithmetic number, because the mean of its divisors is an integer number (19414444).

Almost surely, 2^66563804 is an apocalyptic number.

It is an amenable number.

66563804 is a deficient number, since it is larger than the sum of its proper divisors (49922860).

66563804 is a wasteful number, since it uses less digits than its factorization.

66563804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16640955 (or 16640953 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 66563804 is about 8158.6643514732. The cubic root of 66563804 is about 405.2714818505.

The spelling of 66563804 in words is "sixty-six million, five hundred sixty-three thousand, eight hundred four".