638056379759 has 8 divisors (see below), whose sum is σ = 638863303680. Its totient is φ = 637249568056.

The previous prime is 638056379707. The next prime is 638056379761. The reversal of 638056379759 is 957973650836.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 638056379759 - 2¹⁶ = 638056314223 is a prime.

It is a super-2 number, since 2×638056379759² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638056379459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21670922 + ... + 21700344.

It is an arithmetic number, because the mean of its divisors is an integer number (79857912960).

Almost surely, 2^638056379759 is an apocalyptic number.

638056379759 is a deficient number, since it is larger than the sum of its proper divisors (806923921).

638056379759 is a wasteful number, since it uses less digits than its factorization.

638056379759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56109.

The product of its (nonzero) digits is 257191200, while the sum is 68.

The spelling of 638056379759 in words is "six hundred thirty-eight billion, fifty-six million, three hundred seventy-nine thousand, seven hundred fifty-nine".