65505647 has 2 divisors, whose sum is σ = 65505648. Its totient is φ = 65505646.

The previous prime is 65505589. The next prime is 65505683. The reversal of 65505647 is 74650556.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65505647 - 2²⁴ = 48728431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65505647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65505247) 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, 32752823 + 32752824.

It is an arithmetic number, because the mean of its divisors is an integer number (32752824).

Almost surely, 2^65505647 is an apocalyptic number.

65505647 is a deficient number, since it is larger than the sum of its proper divisors (1).

65505647 is an equidigital number, since it uses as much as digits as its factorization.

65505647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126000, while the sum is 38.

The square root of 65505647 is about 8093.5558934253. Note that the first 3 decimals coincide. The cubic root of 65505647 is about 403.1124828916.

The spelling of 65505647 in words is "sixty-five million, five hundred five thousand, six hundred forty-seven".