66894289 has 16 divisors (see below), whose sum is σ = 83627136. Its totient is φ = 51984000.

The previous prime is 66894251. The next prime is 66894319. The reversal of 66894289 is 98249866.

It is a cyclic number.

It is not a de Polignac number, because 66894289 - 2¹³ = 66886097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66894209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34239 + ... + 36139.

It is an arithmetic number, because the mean of its divisors is an integer number (5226696).

Almost surely, 2^66894289 is an apocalyptic number.

It is an amenable number.

66894289 is a deficient number, since it is larger than the sum of its proper divisors (16732847).

66894289 is a wasteful number, since it uses less digits than its factorization.

66894289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2376.

The product of its digits is 1492992, while the sum is 52.

The square root of 66894289 is about 8178.8928957408. The cubic root of 66894289 is about 405.9410904846.

The spelling of 66894289 in words is "sixty-six million, eight hundred ninety-four thousand, two hundred eighty-nine".