64944881 has 2 divisors, whose sum is σ = 64944882. Its totient is φ = 64944880.

The previous prime is 64944863. The next prime is 64944883. The reversal of 64944881 is 18844946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53949025 + 10995856 = 7345^2 + 3316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64944881 is a prime.

It is a super-2 number, since 2×64944881² = 8435675136208322, which contains 22 as substring.

Together with 64944883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64944883) 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, 32472440 + 32472441.

It is an arithmetic number, because the mean of its divisors is an integer number (32472441).

Almost surely, 2^64944881 is an apocalyptic number.

It is an amenable number.

64944881 is a deficient number, since it is larger than the sum of its proper divisors (1).

64944881 is an equidigital number, since it uses as much as digits as its factorization.

64944881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 44.

The square root of 64944881 is about 8058.8386880493. The cubic root of 64944881 is about 401.9588932663.

The spelling of 64944881 in words is "sixty-four million, nine hundred forty-four thousand, eight hundred eighty-one".