65738821 has 2 divisors, whose sum is σ = 65738822. Its totient is φ = 65738820.

The previous prime is 65738819. The next prime is 65738843. The reversal of 65738821 is 12883756.

65738821 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., 47128225 + 18610596 = 6865^2 + 4314^2 .

It is a cyclic number.

It is not a de Polignac number, because 65738821 - 2¹ = 65738819 is a prime.

Together with 65738819, 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 (65738851) 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, 32869410 + 32869411.

It is an arithmetic number, because the mean of its divisors is an integer number (32869411).

Almost surely, 2^65738821 is an apocalyptic number.

It is an amenable number.

65738821 is a deficient number, since it is larger than the sum of its proper divisors (1).

65738821 is an equidigital number, since it uses as much as digits as its factorization.

65738821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 65738821 is about 8107.9480141402. The cubic root of 65738821 is about 403.5902230853.

The spelling of 65738821 in words is "sixty-five million, seven hundred thirty-eight thousand, eight hundred twenty-one".