64238638841 has 8 divisors (see below), whose sum is σ = 69589424520. Its totient is φ = 59297203056.

The previous prime is 64238638787. The next prime is 64238638847. The reversal of 64238638841 is 14883683246.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 30483763216 + 33754875625 = 174596^2 + 183725^2 .

It is a de Polignac number, because none of the positive numbers 2^k-64238638841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64238638847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14617430 + ... + 14621823.

It is an arithmetic number, because the mean of its divisors is an integer number (8698678065).

Almost surely, 2^64238638841 is an apocalyptic number.

It is an amenable number.

64238638841 is a deficient number, since it is larger than the sum of its proper divisors (5350785679).

64238638841 is an equidigital number, since it uses as much as digits as its factorization.

64238638841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29239292 (or 29239266 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 53.

The spelling of 64238638841 in words is "sixty-four billion, two hundred thirty-eight million, six hundred thirty-eight thousand, eight hundred forty-one".