638452323842 has 16 divisors (see below), whose sum is σ = 958859741952. Its totient is φ = 318832506720.

The previous prime is 638452323841. The next prime is 638452323851. The reversal of 638452323842 is 248323254836.

It is not an unprimeable number, because it can be changed into a prime (638452323841) 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 7 ways as a sum of consecutive naturals, for example, 16610198 + ... + 16648590.

It is an arithmetic number, because the mean of its divisors is an integer number (59928733872).

Almost surely, 2^638452323842 is an apocalyptic number.

638452323842 is a deficient number, since it is larger than the sum of its proper divisors (320407418110).

638452323842 is a wasteful number, since it uses less digits than its factorization.

638452323842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48433.

The product of its digits is 6635520, while the sum is 50.

The spelling of 638452323842 in words is "six hundred thirty-eight billion, four hundred fifty-two million, three hundred twenty-three thousand, eight hundred forty-two".