138425439665 has 8 divisors (see below), whose sum is σ = 166115824488. Its totient is φ = 110736820480.

The previous prime is 138425439661. The next prime is 138425439679. The reversal of 138425439665 is 566934524831.

It can be written as a sum of positive squares in 4 ways, for example, as 77680936369 + 60744503296 = 278713^2 + 246464^2 .

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

It is not a de Polignac number, because 138425439665 - 2² = 138425439661 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 138425439665.

It is not an unprimeable number, because it can be changed into a prime (138425439661) 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 7 ways as a sum of consecutive naturals, for example, 262322 + ... + 587931.

It is an arithmetic number, because the mean of its divisors is an integer number (20764478061).

Almost surely, 2^138425439665 is an apocalyptic number.

It is an amenable number.

138425439665 is a deficient number, since it is larger than the sum of its proper divisors (27690384823).

138425439665 is an equidigital number, since it uses as much as digits as its factorization.

138425439665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882819.

The product of its digits is 18662400, while the sum is 56.

The spelling of 138425439665 in words is "one hundred thirty-eight billion, four hundred twenty-five million, four hundred thirty-nine thousand, six hundred sixty-five".