66536578 has 16 divisors (see below), whose sum is σ = 101953080. Its totient is φ = 32560000.

The previous prime is 66536573. The next prime is 66536579. The reversal of 66536578 is 87563566.

It is a happy number.

66536578 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 60171049 + 6365529 = 7757^2 + 2523^2 .

It is not an unprimeable number, because it can be changed into a prime (66536573) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 16128 + ... + 19828.

Almost surely, 2^66536578 is an apocalyptic number.

66536578 is a deficient number, since it is larger than the sum of its proper divisors (35416502).

66536578 is a wasteful number, since it uses less digits than its factorization.

66536578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3893.

The product of its digits is 907200, while the sum is 46.

The square root of 66536578 is about 8156.9956479086. The cubic root of 66536578 is about 405.2162194536.

It can be divided in two parts, 6653 and 6578, that added together give a palindrome (13231).

The spelling of 66536578 in words is "sixty-six million, five hundred thirty-six thousand, five hundred seventy-eight".