138208325645 has 16 divisors (see below), whose sum is σ = 178626367920. Its totient is φ = 102050855424.

The previous prime is 138208325623. The next prime is 138208325663. The reversal of 138208325645 is 546523802831.

It can be written as a sum of positive squares in 8 ways, for example, as 5145336361 + 133062989284 = 71731^2 + 364778^2 .

It is a cyclic number.

It is not a de Polignac number, because 138208325645 - 2¹⁸ = 138208063501 is a prime.

It is a super-3 number, since 3×138208325645³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138208325645.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 544367 + ... + 756803.

It is an arithmetic number, because the mean of its divisors is an integer number (11164147995).

Almost surely, 2^138208325645 is an apocalyptic number.

It is an amenable number.

138208325645 is a deficient number, since it is larger than the sum of its proper divisors (40418042275).

138208325645 is a wasteful number, since it uses less digits than its factorization.

138208325645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222464.

The product of its (nonzero) digits is 1382400, while the sum is 47.

The spelling of 138208325645 in words is "one hundred thirty-eight billion, two hundred eight million, three hundred twenty-five thousand, six hundred forty-five".