65421613 has 2 divisors, whose sum is σ = 65421614. Its totient is φ = 65421612.

The previous prime is 65421611. The next prime is 65421623. The reversal of 65421613 is 31612456.

65421613 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., 45333289 + 20088324 = 6733^2 + 4482^2 .

It is a cyclic number.

It is not a de Polignac number, because 65421613 - 2¹ = 65421611 is a prime.

Together with 65421611, 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 (65421611) 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, 32710806 + 32710807.

It is an arithmetic number, because the mean of its divisors is an integer number (32710807).

Almost surely, 2^65421613 is an apocalyptic number.

It is an amenable number.

65421613 is a deficient number, since it is larger than the sum of its proper divisors (1).

65421613 is an equidigital number, since it uses as much as digits as its factorization.

65421613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 28.

The square root of 65421613 is about 8088.3628133263. The cubic root of 65421613 is about 402.9400313455.

The spelling of 65421613 in words is "sixty-five million, four hundred twenty-one thousand, six hundred thirteen".