638844514244 has 12 divisors (see below), whose sum is σ = 1122859901100. Its totient is φ = 318027399648.

The previous prime is 638844514237. The next prime is 638844514313. The reversal of 638844514244 is 442415448836.

It can be written as a sum of positive squares in 2 ways, for example, as 268282561600 + 370561952644 = 517960^2 + 608738^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348713339 + ... + 348715170.

It is an arithmetic number, because the mean of its divisors is an integer number (93571658425).

Almost surely, 2^638844514244 is an apocalyptic number.

It is an amenable number.

638844514244 is a deficient number, since it is larger than the sum of its proper divisors (484015386856).

638844514244 is a wasteful number, since it uses less digits than its factorization.

638844514244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697428742 (or 697428740 counting only the distinct ones).

The product of its digits is 11796480, while the sum is 53.

The spelling of 638844514244 in words is "six hundred thirty-eight billion, eight hundred forty-four million, five hundred fourteen thousand, two hundred forty-four".