638885245882755 has 32 divisors (see below), whose sum is σ = 1069346866478400. Its totient is φ = 325292676380672.

The previous prime is 638885245882727. The next prime is 638885245882847. The reversal of 638885245882755 is 557288542588836.

It is a cyclic number.

It is not a de Polignac number, because 638885245882755 - 2⁹ = 638885245882243 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8251094514 + ... + 8251171943.

It is an arithmetic number, because the mean of its divisors is an integer number (33417089577450).

Almost surely, 2^{638885245882755} is an apocalyptic number.

638885245882755 is a deficient number, since it is larger than the sum of its proper divisors (430461620595645).

638885245882755 is a wasteful number, since it uses less digits than its factorization.

638885245882755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16502266583.

The product of its digits is 41287680000, while the sum is 84.

The spelling of 638885245882755 in words is "six hundred thirty-eight trillion, eight hundred eighty-five billion, two hundred forty-five million, eight hundred eighty-two thousand, seven hundred fifty-five".