65716643 has 2 divisors, whose sum is σ = 65716644. Its totient is φ = 65716642.

The previous prime is 65716633. The next prime is 65716657. The reversal of 65716643 is 34661756.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65716643 - 2⁶ = 65716579 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65716597 and 65716606.

It is not a weakly prime, because it can be changed into another prime (65716633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32858321 + 32858322.

It is an arithmetic number, because the mean of its divisors is an integer number (32858322).

Almost surely, 2^65716643 is an apocalyptic number.

65716643 is a deficient number, since it is larger than the sum of its proper divisors (1).

65716643 is an equidigital number, since it uses as much as digits as its factorization.

65716643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 38.

The square root of 65716643 is about 8106.5802284317. The cubic root of 65716643 is about 403.5448321956.

The spelling of 65716643 in words is "sixty-five million, seven hundred sixteen thousand, six hundred forty-three".