64553309 has 2 divisors, whose sum is σ = 64553310. Its totient is φ = 64553308.

The previous prime is 64553303. The next prime is 64553323. The reversal of 64553309 is 90335546.

64553309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62805625 + 1747684 = 7925^2 + 1322^2 .

It is a cyclic number.

It is not a de Polignac number, because 64553309 - 2²⁰ = 63504733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64553303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32276654 + 32276655.

It is an arithmetic number, because the mean of its divisors is an integer number (32276655).

Almost surely, 2^64553309 is an apocalyptic number.

It is an amenable number.

64553309 is a deficient number, since it is larger than the sum of its proper divisors (1).

64553309 is an equidigital number, since it uses as much as digits as its factorization.

64553309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 35.

The square root of 64553309 is about 8034.5073900022. The cubic root of 64553309 is about 401.1494209981.

The spelling of 64553309 in words is "sixty-four million, five hundred fifty-three thousand, three hundred nine".