65647 has 2 divisors, whose sum is σ = 65648. Its totient is φ = 65646.

The previous prime is 65633. The next prime is 65651. The reversal of 65647 is 74656.

It is a strong prime.

65647 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 65647 - 2⁷ = 65519 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32823 + 32824.

It is an arithmetic number, because the mean of its divisors is an integer number (32824).

2⁶⁵⁶⁴⁷ is an apocalyptic number.

65647 is a deficient number, since it is larger than the sum of its proper divisors (1).

65647 is an equidigital number, since it uses as much as digits as its factorization.

65647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 28.

The square root of 65647 is about 256.2167051541. The cubic root of 65647 is about 40.3402230032.

Subtracting 65647 from its reverse (74656), we obtain a palindrome (9009).

It can be divided in two parts, 656 and 47, that added together give a triangular number (703 = T₃₇).

The spelling of 65647 in words is "sixty-five thousand, six hundred forty-seven".