66645189 has 12 divisors (see below), whose sum is σ = 103670476. Its totient is φ = 41012352.

The previous prime is 66645169. The next prime is 66645193. The reversal of 66645189 is 98154666.

It can be written as a sum of positive squares in 2 ways, for example, as 17994564 + 48650625 = 4242^2 + 6975^2 .

It is not a de Polignac number, because 66645189 - 2¹¹ = 66643141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66645149) 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, 284692 + ... + 284925.

Almost surely, 2^66645189 is an apocalyptic number.

It is an amenable number.

66645189 is a deficient number, since it is larger than the sum of its proper divisors (37025287).

66645189 is a wasteful number, since it uses less digits than its factorization.

66645189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569636 (or 569633 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 66645189 is about 8163.6504702247. The cubic root of 66645189 is about 405.4365845256.

The spelling of 66645189 in words is "sixty-six million, six hundred forty-five thousand, one hundred eighty-nine".