138676665601 has 8 divisors (see below), whose sum is σ = 138797083304. Its totient is φ = 138556293120.

The previous prime is 138676665599. The next prime is 138676665629. The reversal of 138676665601 is 106566676831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 34590420225 + 104086245376 = 185985^2 + 322624^2 .

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 138676665601 - 2¹ = 138676665599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138676665641) 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, 9020161 + ... + 9035521.

It is an arithmetic number, because the mean of its divisors is an integer number (17349635413).

Almost surely, 2^138676665601 is an apocalyptic number.

It is an amenable number.

138676665601 is a deficient number, since it is larger than the sum of its proper divisors (120417703).

138676665601 is a wasteful number, since it uses less digits than its factorization.

138676665601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22611.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 138676665601 in words is "one hundred thirty-eight billion, six hundred seventy-six million, six hundred sixty-five thousand, six hundred one".