638374640126 has 8 divisors (see below), whose sum is σ = 957578636280. Its totient is φ = 319181761368.

The previous prime is 638374640083. The next prime is 638374640131. The reversal of 638374640126 is 621046473836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2634281 + ... + 2866388.

It is an arithmetic number, because the mean of its divisors is an integer number (119697329535).

Almost surely, 2^638374640126 is an apocalyptic number.

638374640126 is a deficient number, since it is larger than the sum of its proper divisors (319203996154).

638374640126 is a wasteful number, since it uses less digits than its factorization.

638374640126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5558698.

The product of its (nonzero) digits is 3483648, while the sum is 50.

The spelling of 638374640126 in words is "six hundred thirty-eight billion, three hundred seventy-four million, six hundred forty thousand, one hundred twenty-six".