66563600 has 30 divisors (see below), whose sum is σ = 159920010. Its totient is φ = 26625280.

The previous prime is 66563599. The next prime is 66563611. The reversal of 66563600 is 636566.

It can be written as a sum of positive squares in 3 ways, for example, as 43264 + 66520336 = 208^2 + 8156^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 82805 + ... + 83604.

It is an arithmetic number, because the mean of its divisors is an integer number (5330667).

Almost surely, 2^66563600 is an apocalyptic number.

It is an amenable number.

66563600 is an abundant number, since it is smaller than the sum of its proper divisors (93356410).

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

66563600 is a wasteful number, since it uses less digits than its factorization.

66563600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166427 (or 166416 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 66563600 is about 8158.6518494173. The cubic root of 66563600 is about 405.2710678344.

The spelling of 66563600 in words is "sixty-six million, five hundred sixty-three thousand, six hundred".