65544389 has 2 divisors, whose sum is σ = 65544390. Its totient is φ = 65544388.

The previous prime is 65544373. The next prime is 65544403. The reversal of 65544389 is 98344556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64240225 + 1304164 = 8015^2 + 1142^2 .

It is a cyclic number.

It is not a de Polignac number, because 65544389 - 2⁴ = 65544373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65543389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32772194 + 32772195.

It is an arithmetic number, because the mean of its divisors is an integer number (32772195).

Almost surely, 2^65544389 is an apocalyptic number.

It is an amenable number.

65544389 is a deficient number, since it is larger than the sum of its proper divisors (1).

65544389 is an equidigital number, since it uses as much as digits as its factorization.

65544389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 44.

The square root of 65544389 is about 8095.9489252342. The cubic root of 65544389 is about 403.1919381583.

The spelling of 65544389 in words is "sixty-five million, five hundred forty-four thousand, three hundred eighty-nine".