65638247 has 2 divisors, whose sum is σ = 65638248. Its totient is φ = 65638246.

The previous prime is 65638231. The next prime is 65638249. The reversal of 65638247 is 74283656.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65638247 - 2⁴ = 65638231 is a prime.

Together with 65638249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65638249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32819123 + 32819124.

It is an arithmetic number, because the mean of its divisors is an integer number (32819124).

Almost surely, 2^65638247 is an apocalyptic number.

65638247 is a deficient number, since it is larger than the sum of its proper divisors (1).

65638247 is an equidigital number, since it uses as much as digits as its factorization.

65638247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 41.

The square root of 65638247 is about 8101.7434543436. The cubic root of 65638247 is about 403.3843001110.

The spelling of 65638247 in words is "sixty-five million, six hundred thirty-eight thousand, two hundred forty-seven".