64648381289 has 2 divisors, whose sum is σ = 64648381290. Its totient is φ = 64648381288.

The previous prime is 64648381249. The next prime is 64648381309. The reversal of 64648381289 is 98218384646.

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., 64575449689 + 72931600 = 254117^2 + 8540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64648381289 is a prime.

It is not a weakly prime, because it can be changed into another prime (64648381219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32324190644 + 32324190645.

It is an arithmetic number, because the mean of its divisors is an integer number (32324190645).

Almost surely, 2^64648381289 is an apocalyptic number.

It is an amenable number.

64648381289 is a deficient number, since it is larger than the sum of its proper divisors (1).

64648381289 is an equidigital number, since it uses as much as digits as its factorization.

64648381289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15925248, while the sum is 59.

The spelling of 64648381289 in words is "sixty-four billion, six hundred forty-eight million, three hundred eighty-one thousand, two hundred eighty-nine".