138863205903 has 16 divisors (see below), whose sum is σ = 190166468576. Its totient is φ = 90068008320.

The previous prime is 138863205889. The next prime is 138863205913. The reversal of 138863205903 is 309502368831.

It is a happy number.

It is not a de Polignac number, because 138863205903 - 2⁸ = 138863205647 is a prime.

It is a super-3 number, since 3×138863205903³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138863205913) 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 15 ways as a sum of consecutive naturals, for example, 2720073 + ... + 2770653.

It is an arithmetic number, because the mean of its divisors is an integer number (11885404286).

Almost surely, 2^138863205903 is an apocalyptic number.

138863205903 is a deficient number, since it is larger than the sum of its proper divisors (51303262673).

138863205903 is a wasteful number, since it uses less digits than its factorization.

138863205903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75354.

The product of its (nonzero) digits is 933120, while the sum is 48.

The spelling of 138863205903 in words is "one hundred thirty-eight billion, eight hundred sixty-three million, two hundred five thousand, nine hundred three".