64443811 has 2 divisors, whose sum is σ = 64443812. Its totient is φ = 64443810.

The previous prime is 64443809. The next prime is 64443817. The reversal of 64443811 is 11834446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64443811 - 2¹ = 64443809 is a prime.

Together with 64443809, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (64443817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32221905 + 32221906.

It is an arithmetic number, because the mean of its divisors is an integer number (32221906).

Almost surely, 2^64443811 is an apocalyptic number.

64443811 is a deficient number, since it is larger than the sum of its proper divisors (1).

64443811 is an equidigital number, since it uses as much as digits as its factorization.

64443811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 31.

The square root of 64443811 is about 8027.6902655745. The cubic root of 64443811 is about 400.9224772041.

The spelling of 64443811 in words is "sixty-four million, four hundred forty-three thousand, eight hundred eleven".