66699585 has 32 divisors (see below), whose sum is σ = 125556480. Its totient is φ = 33479424.

The previous prime is 66699571. The next prime is 66699587. The reversal of 66699585 is 58599666.

66699585 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66699585 - 2¹⁰ = 66698561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66699587) 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 31 ways as a sum of consecutive naturals, for example, 12237 + ... + 16826.

It is an arithmetic number, because the mean of its divisors is an integer number (3923640).

Almost surely, 2^66699585 is an apocalyptic number.

It is an amenable number.

66699585 is a deficient number, since it is larger than the sum of its proper divisors (58856895).

66699585 is a wasteful number, since it uses less digits than its factorization.

66699585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29094 (or 29088 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 54.

The square root of 66699585 is about 8166.9813884935. The cubic root of 66699585 is about 405.5468607075.

The spelling of 66699585 in words is "sixty-six million, six hundred ninety-nine thousand, five hundred eighty-five".