6645189 has 8 divisors (see below), whose sum is σ = 9048960. Its totient is φ = 4335776.

The previous prime is 6645187. The next prime is 6645209. The reversal of 6645189 is 9815466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6645189 - 2¹ = 6645187 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23424 + ... + 23705.

It is an arithmetic number, because the mean of its divisors is an integer number (1131120).

Almost surely, 2^6645189 is an apocalyptic number.

It is an amenable number.

6645189 is a deficient number, since it is larger than the sum of its proper divisors (2403771).

6645189 is a wasteful number, since it uses less digits than its factorization.

6645189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47179.

The product of its digits is 51840, while the sum is 39.

The square root of 6645189 is about 2577.8264099819. The cubic root of 6645189 is about 188.0048757601.

The spelling of 6645189 in words is "six million, six hundred forty-five thousand, one hundred eighty-nine".