64105681 has 2 divisors, whose sum is σ = 64105682. Its totient is φ = 64105680.

The previous prime is 64105637. The next prime is 64105703. The reversal of 64105681 is 18650146.

64105681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61481281 + 2624400 = 7841^2 + 1620^2 .

It is a cyclic number.

It is not a de Polignac number, because 64105681 - 2¹⁹ = 63581393 is a prime.

It is a super-2 number, since 2×64105681² = 8219076672947522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64105621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32052840 + 32052841.

It is an arithmetic number, because the mean of its divisors is an integer number (32052841).

Almost surely, 2^64105681 is an apocalyptic number.

It is an amenable number.

64105681 is a deficient number, since it is larger than the sum of its proper divisors (1).

64105681 is an equidigital number, since it uses as much as digits as its factorization.

64105681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 64105681 is about 8006.6023380707. The cubic root of 64105681 is about 400.2200476754.

The spelling of 64105681 in words is "sixty-four million, one hundred five thousand, six hundred eighty-one".