638106270188 has 6 divisors (see below), whose sum is σ = 1116685972836. Its totient is φ = 319053135092.

The previous prime is 638106270187. The next prime is 638106270199. The reversal of 638106270188 is 881072601836.

It is a super-2 number, since 2×638106270188² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (638106270187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79763283770 + ... + 79763283777.

It is an arithmetic number, because the mean of its divisors is an integer number (186114328806).

Almost surely, 2^638106270188 is an apocalyptic number.

It is an amenable number.

638106270188 is a deficient number, since it is larger than the sum of its proper divisors (478579702648).

638106270188 is a wasteful number, since it uses less digits than its factorization.

638106270188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159526567551 (or 159526567549 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 638106270188 in words is "six hundred thirty-eight billion, one hundred six million, two hundred seventy thousand, one hundred eighty-eight".