65664043 has 2 divisors, whose sum is σ = 65664044. Its totient is φ = 65664042.

The previous prime is 65664041. The next prime is 65664059. The reversal of 65664043 is 34046656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65664043 - 2¹ = 65664041 is a prime.

Together with 65664041, it forms a pair of twin primes.

It is equal to p_3877405 and since 65664043 and 3877405 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (65664041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32832021 + 32832022.

It is an arithmetic number, because the mean of its divisors is an integer number (32832022).

Almost surely, 2^65664043 is an apocalyptic number.

65664043 is a deficient number, since it is larger than the sum of its proper divisors (1).

65664043 is an equidigital number, since it uses as much as digits as its factorization.

65664043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 65664043 is about 8103.3353009733. The cubic root of 65664043 is about 403.4371368793.

It can be divided in two parts, 6566 and 4043, that added together give a square (10609 = 103²).

The spelling of 65664043 in words is "sixty-five million, six hundred sixty-four thousand, forty-three".