64438841111 has 2 divisors, whose sum is σ = 64438841112. Its totient is φ = 64438841110.

The previous prime is 64438840981. The next prime is 64438841113. The reversal of 64438841111 is 11114883446.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64438841111 is a prime.

Together with 64438841113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64438841113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32219420555 + 32219420556.

It is an arithmetic number, because the mean of its divisors is an integer number (32219420556).

Almost surely, 2^64438841111 is an apocalyptic number.

64438841111 is a deficient number, since it is larger than the sum of its proper divisors (1).

64438841111 is an equidigital number, since it uses as much as digits as its factorization.

64438841111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 41.

The spelling of 64438841111 in words is "sixty-four billion, four hundred thirty-eight million, eight hundred forty-one thousand, one hundred eleven".