138168953485 has 4 divisors (see below), whose sum is σ = 165802744188. Its totient is φ = 110535162784.

The previous prime is 138168953441. The next prime is 138168953491. The reversal of 138168953485 is 584359861831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 584359861831 = 619 ⋅944038549.

It can be written as a sum of positive squares in 2 ways, for example, as 80716219236 + 57452734249 = 284106^2 + 239693^2 .

It is a cyclic number.

It is not a de Polignac number, because 138168953485 - 2²⁷ = 138034735757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13816895344 + ... + 13816895353.

It is an arithmetic number, because the mean of its divisors is an integer number (41450686047).

Almost surely, 2^138168953485 is an apocalyptic number.

It is an amenable number.

138168953485 is a deficient number, since it is larger than the sum of its proper divisors (27633790703).

138168953485 is an equidigital number, since it uses as much as digits as its factorization.

138168953485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27633790702.

The product of its digits is 24883200, while the sum is 61.

The spelling of 138168953485 in words is "one hundred thirty-eight billion, one hundred sixty-eight million, nine hundred fifty-three thousand, four hundred eighty-five".