64818765289 has 2 divisors, whose sum is σ = 64818765290. Its totient is φ = 64818765288.

The previous prime is 64818765283. The next prime is 64818765293. The reversal of 64818765289 is 98256781846.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56330275600 + 8488489689 = 237340^2 + 92133^2 .

It is a cyclic number.

It is not a de Polignac number, because 64818765289 - 2¹¹ = 64818763241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64818765289.

It is not a weakly prime, because it can be changed into another prime (64818765283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32409382644 + 32409382645.

It is an arithmetic number, because the mean of its divisors is an integer number (32409382645).

Almost surely, 2^64818765289 is an apocalyptic number.

It is an amenable number.

64818765289 is a deficient number, since it is larger than the sum of its proper divisors (1).

64818765289 is an equidigital number, since it uses as much as digits as its factorization.

64818765289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46448640, while the sum is 64.

The spelling of 64818765289 in words is "sixty-four billion, eight hundred eighteen million, seven hundred sixty-five thousand, two hundred eighty-nine".