638888446713 has 32 divisors (see below), whose sum is σ = 933006412800. Its totient is φ = 385659437760.

The previous prime is 638888446711. The next prime is 638888446747. The reversal of 638888446713 is 317644888836.

It is not a de Polignac number, because 638888446713 - 2¹ = 638888446711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638888446711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14150731 + ... + 14195807.

It is an arithmetic number, because the mean of its divisors is an integer number (29156450400).

Almost surely, 2^638888446713 is an apocalyptic number.

It is an amenable number.

638888446713 is a deficient number, since it is larger than the sum of its proper divisors (294117966087).

638888446713 is a wasteful number, since it uses less digits than its factorization.

638888446713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46797.

The product of its digits is 148635648, while the sum is 66.

It can be divided in two parts, 638888 and 446713, that added together give a triangular number (1085601 = T₁₄₇₃).

The spelling of 638888446713 in words is "six hundred thirty-eight billion, eight hundred eighty-eight million, four hundred forty-six thousand, seven hundred thirteen".