138569318821 has 8 divisors (see below), whose sum is σ = 138782145600. Its totient is φ = 138356574240.

The previous prime is 138569318819. The next prime is 138569318917. The reversal of 138569318821 is 128813965831.

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 138569318821 - 2¹ = 138569318819 is a prime.

It is a super-2 number, since 2×138569318821² (a number of 23 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 (138569318521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3923640 + ... + 3958798.

It is an arithmetic number, because the mean of its divisors is an integer number (17347768200).

Almost surely, 2^138569318821 is an apocalyptic number.

It is an amenable number.

138569318821 is a deficient number, since it is larger than the sum of its proper divisors (212826779).

138569318821 is an equidigital number, since it uses as much as digits as its factorization.

138569318821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41099.

The product of its digits is 2488320, while the sum is 55.

The spelling of 138569318821 in words is "one hundred thirty-eight billion, five hundred sixty-nine million, three hundred eighteen thousand, eight hundred twenty-one".