65644991983 has 2 divisors, whose sum is σ = 65644991984. Its totient is φ = 65644991982.

The previous prime is 65644991981. The next prime is 65644992103. The reversal of 65644991983 is 38919944656.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65644991983 - 2¹ = 65644991981 is a prime.

Together with 65644991981, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65644991981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32822495991 + 32822495992.

It is an arithmetic number, because the mean of its divisors is an integer number (32822495992).

Almost surely, 2^65644991983 is an apocalyptic number.

65644991983 is a deficient number, since it is larger than the sum of its proper divisors (1).

65644991983 is an equidigital number, since it uses as much as digits as its factorization.

65644991983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50388480, while the sum is 64.

The spelling of 65644991983 in words is "sixty-five billion, six hundred forty-four million, nine hundred ninety-one thousand, nine hundred eighty-three".