64944618511 has 2 divisors, whose sum is σ = 64944618512. Its totient is φ = 64944618510.

The previous prime is 64944618451. The next prime is 64944618539. The reversal of 64944618511 is 11581644946.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64944618511 - 2²³ = 64936229903 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64944618911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32472309255 + 32472309256.

It is an arithmetic number, because the mean of its divisors is an integer number (32472309256).

Almost surely, 2^64944618511 is an apocalyptic number.

64944618511 is a deficient number, since it is larger than the sum of its proper divisors (1).

64944618511 is an equidigital number, since it uses as much as digits as its factorization.

64944618511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 49.

The spelling of 64944618511 in words is "sixty-four billion, nine hundred forty-four million, six hundred eighteen thousand, five hundred eleven".