65646643 has 2 divisors, whose sum is σ = 65646644. Its totient is φ = 65646642.

The previous prime is 65646631. The next prime is 65646649. The reversal of 65646643 is 34664656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65646643 - 2⁵ = 65646611 is a prime.

It is equal to p_3876457 and since 65646643 and 3876457 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 65646596 and 65646605.

It is not a weakly prime, because it can be changed into another prime (65646649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32823321 + 32823322.

It is an arithmetic number, because the mean of its divisors is an integer number (32823322).

Almost surely, 2^65646643 is an apocalyptic number.

65646643 is a deficient number, since it is larger than the sum of its proper divisors (1).

65646643 is an equidigital number, since it uses as much as digits as its factorization.

65646643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 40.

The square root of 65646643 is about 8102.2615978503. The cubic root of 65646643 is about 403.4014987736.

The spelling of 65646643 in words is "sixty-five million, six hundred forty-six thousand, six hundred forty-three".