638182409706 has 12 divisors (see below), whose sum is σ = 1382728554402. Its totient is φ = 212727469896.

The previous prime is 638182409687. The next prime is 638182409747. The reversal of 638182409706 is 607904281836.

It can be written as a sum of positive squares in only one way, i.e., 471363260481 + 166819149225 = 686559^2 + 408435^2 .

It is a super-4 number, since 4×638182409706⁴ (a number of 48 digits) contains 4444 as substring.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 17727289141 + ... + 17727289176.

Almost surely, 2^638182409706 is an apocalyptic number.

638182409706 is an abundant number, since it is smaller than the sum of its proper divisors (744546144696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638182409706 is a wasteful number, since it uses less digits than its factorization.

638182409706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35454578325 (or 35454578322 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 638182409706 in words is "six hundred thirty-eight billion, one hundred eighty-two million, four hundred nine thousand, seven hundred six".