66909583 has 16 divisors (see below), whose sum is σ = 78472800. Its totient is φ = 56488320.

The previous prime is 66909559. The next prime is 66909593. The reversal of 66909583 is 38590966.

It is a cyclic number.

It is not a de Polignac number, because 66909583 - 2¹³ = 66901391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66909523) 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 15 ways as a sum of consecutive naturals, for example, 2493 + ... + 11833.

It is an arithmetic number, because the mean of its divisors is an integer number (4904550).

Almost surely, 2^66909583 is an apocalyptic number.

66909583 is a deficient number, since it is larger than the sum of its proper divisors (11563217).

66909583 is a wasteful number, since it uses less digits than its factorization.

66909583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9402.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 66909583 is about 8179.8278099236. The cubic root of 66909583 is about 405.9720248142.

The spelling of 66909583 in words is "sixty-six million, nine hundred nine thousand, five hundred eighty-three".