138017584454161 has 4 divisors (see below), whose sum is σ = 139025012078052. Its totient is φ = 137010156830272.

The previous prime is 138017584454153. The next prime is 138017584454171. The reversal of 138017584454161 is 161454485710831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28247960044161 + 109769624410000 = 5314881^2 + 10477100^2 .

It is a cyclic number.

It is not a de Polignac number, because 138017584454161 - 2³ = 138017584454153 is a prime.

It is a super-2 number, since 2×138017584454161² (a number of 29 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138017584454096 and 138017584454105.

It is not an unprimeable number, because it can be changed into a prime (138017584454131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503713811740 + ... + 503713812013.

It is an arithmetic number, because the mean of its divisors is an integer number (34756253019513).

Almost surely, 2^{138017584454161} is an apocalyptic number.

It is an amenable number.

138017584454161 is a deficient number, since it is larger than the sum of its proper divisors (1007427623891).

138017584454161 is a wasteful number, since it uses less digits than its factorization.

138017584454161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007427623890.

The product of its (nonzero) digits is 12902400, while the sum is 58.

The spelling of 138017584454161 in words is "one hundred thirty-eight trillion, seventeen billion, five hundred eighty-four million, four hundred fifty-four thousand, one hundred sixty-one".