65506513 has 2 divisors, whose sum is σ = 65506514. Its totient is φ = 65506512.

The previous prime is 65506499. The next prime is 65506531. The reversal of 65506513 is 31560556.

Together with next prime (65506531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38539264 + 26967249 = 6208^2 + 5193^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65506513 is a prime.

It is a super-2 number, since 2×65506513² = 8582206490838338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65506583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32753256 + 32753257.

It is an arithmetic number, because the mean of its divisors is an integer number (32753257).

Almost surely, 2^65506513 is an apocalyptic number.

It is an amenable number.

65506513 is a deficient number, since it is larger than the sum of its proper divisors (1).

65506513 is an equidigital number, since it uses as much as digits as its factorization.

65506513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 65506513 is about 8093.6093926011. The cubic root of 65506513 is about 403.1142592976.

The spelling of 65506513 in words is "sixty-five million, five hundred six thousand, five hundred thirteen".