66508575 has 24 divisors (see below), whose sum is σ = 125670528. Its totient is φ = 30403680.

The previous prime is 66508567. The next prime is 66508577. The reversal of 66508575 is 57580566.

It is not a de Polignac number, because 66508575 - 2³ = 66508567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66508577) 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 in 23 ways as a sum of consecutive naturals, for example, 62817 + ... + 63866.

It is an arithmetic number, because the mean of its divisors is an integer number (5236272).

Almost surely, 2^66508575 is an apocalyptic number.

66508575 is a deficient number, since it is larger than the sum of its proper divisors (59161953).

66508575 is a wasteful number, since it uses less digits than its factorization.

66508575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126703 (or 126698 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 42.

The square root of 66508575 is about 8155.2789651857. The cubic root of 66508575 is about 405.1593641999.

It can be divided in two parts, 6650 and 8575, that added together give a triangular number (15225 = T₁₇₄).

The spelling of 66508575 in words is "sixty-six million, five hundred eight thousand, five hundred seventy-five".