66535570 has 16 divisors (see below), whose sum is σ = 123894360. Its totient is φ = 25696384.

The previous prime is 66535561. The next prime is 66535571. The reversal of 66535570 is 7553566.

66535570 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 42003361 + 24532209 = 6481^2 + 4953^2 .

It is not an unprimeable number, because it can be changed into a prime (66535571) 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, 114427 + ... + 115006.

Almost surely, 2^66535570 is an apocalyptic number.

66535570 is a deficient number, since it is larger than the sum of its proper divisors (57358790).

66535570 is a wasteful number, since it uses less digits than its factorization.

66535570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229469.

The product of its (nonzero) digits is 94500, while the sum is 37.

The square root of 66535570 is about 8156.9338602198. The cubic root of 66535570 is about 405.2141731605.

The spelling of 66535570 in words is "sixty-six million, five hundred thirty-five thousand, five hundred seventy".