638786848089 has 8 divisors (see below), whose sum is σ = 917232397312. Its totient is φ = 393099598800.

The previous prime is 638786848043. The next prime is 638786848093. The reversal of 638786848089 is 980848687836.

638786848089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 638786848089 - 2¹⁵ = 638786815321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 638786848089.

It is not an unprimeable number, because it can be changed into a prime (638786848019) 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, 8189574937 + ... + 8189575014.

It is an arithmetic number, because the mean of its divisors is an integer number (114654049664).

Almost surely, 2^638786848089 is an apocalyptic number.

It is an amenable number.

638786848089 is a deficient number, since it is larger than the sum of its proper divisors (278445549223).

638786848089 is a wasteful number, since it uses less digits than its factorization.

638786848089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16379149967.

The product of its (nonzero) digits is 891813888, while the sum is 75.

The spelling of 638786848089 in words is "six hundred thirty-eight billion, seven hundred eighty-six million, eight hundred forty-eight thousand, eighty-nine".