64618189 has 2 divisors, whose sum is σ = 64618190. Its totient is φ = 64618188.

The previous prime is 64618187. The next prime is 64618223. The reversal of 64618189 is 98181646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45765225 + 18852964 = 6765^2 + 4342^2 .

It is a cyclic number.

It is not a de Polignac number, because 64618189 - 2¹ = 64618187 is a prime.

Together with 64618187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64618187) 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 as a sum of consecutive naturals, namely, 32309094 + 32309095.

It is an arithmetic number, because the mean of its divisors is an integer number (32309095).

Almost surely, 2^64618189 is an apocalyptic number.

It is an amenable number.

64618189 is a deficient number, since it is larger than the sum of its proper divisors (1).

64618189 is an equidigital number, since it uses as much as digits as its factorization.

64618189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 43.

The square root of 64618189 is about 8038.5439601958. The cubic root of 64618189 is about 401.2837691839.

The spelling of 64618189 in words is "sixty-four million, six hundred eighteen thousand, one hundred eighty-nine".