65637389 has 2 divisors, whose sum is σ = 65637390. Its totient is φ = 65637388.

The previous prime is 65637379. The next prime is 65637409. The reversal of 65637389 is 98373656.

65637389 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., 65334889 + 302500 = 8083^2 + 550^2 .

It is a cyclic number.

It is not a de Polignac number, because 65637389 - 2¹⁶ = 65571853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65637349) 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, 32818694 + 32818695.

It is an arithmetic number, because the mean of its divisors is an integer number (32818695).

Almost surely, 2^65637389 is an apocalyptic number.

It is an amenable number.

65637389 is a deficient number, since it is larger than the sum of its proper divisors (1).

65637389 is an equidigital number, since it uses as much as digits as its factorization.

65637389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 47.

The square root of 65637389 is about 8101.6905026050. The cubic root of 65637389 is about 403.3825424709.

The spelling of 65637389 in words is "sixty-five million, six hundred thirty-seven thousand, three hundred eighty-nine".