638083842544 has 20 divisors (see below), whose sum is σ = 1236416509120. Its totient is φ = 319008614400.

The previous prime is 638083842533. The next prime is 638083842551. The reversal of 638083842544 is 445248380836.

It is a congruent number.

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, 1923264 + ... + 2230495.

It is an arithmetic number, because the mean of its divisors is an integer number (61820825456).

Almost surely, 2^638083842544 is an apocalyptic number.

It is an amenable number.

638083842544 is a deficient number, since it is larger than the sum of its proper divisors (598332666576).

638083842544 is a wasteful number, since it uses less digits than its factorization.

638083842544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4163368 (or 4163362 counting only the distinct ones).

The product of its (nonzero) digits is 17694720, while the sum is 55.

The spelling of 638083842544 in words is "six hundred thirty-eight billion, eighty-three million, eight hundred forty-two thousand, five hundred forty-four".