638340158389 has 4 divisors (see below), whose sum is σ = 638342230240. Its totient is φ = 638338086540.

The previous prime is 638340158387. The next prime is 638340158497. The reversal of 638340158389 is 983851043836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 638340158389 - 2¹ = 638340158387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638340158387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471129 + ... + 1224190.

It is an arithmetic number, because the mean of its divisors is an integer number (159585557560).

Almost surely, 2^638340158389 is an apocalyptic number.

It is an amenable number.

638340158389 is a deficient number, since it is larger than the sum of its proper divisors (2071851).

638340158389 is a wasteful number, since it uses less digits than its factorization.

638340158389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2071850.

The product of its (nonzero) digits is 14929920, while the sum is 58.

The spelling of 638340158389 in words is "six hundred thirty-eight billion, three hundred forty million, one hundred fifty-eight thousand, three hundred eighty-nine".