66888189 has 12 divisors (see below), whose sum is σ = 101701600. Its totient is φ = 42245064.

The previous prime is 66888169. The next prime is 66888197. The reversal of 66888189 is 98188866.

It is not a de Polignac number, because 66888189 - 2¹³ = 66879997 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 (66888139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195409 + ... + 195750.

Almost surely, 2^66888189 is an apocalyptic number.

It is an amenable number.

66888189 is a deficient number, since it is larger than the sum of its proper divisors (34813411).

66888189 is a wasteful number, since it uses less digits than its factorization.

66888189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391184 (or 391181 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 54.

The square root of 66888189 is about 8178.5199761326. The cubic root of 66888189 is about 405.9287510360.

The spelling of 66888189 in words is "sixty-six million, eight hundred eighty-eight thousand, one hundred eighty-nine".