138905578698 has 16 divisors (see below), whose sum is σ = 294152990400. Its totient is φ = 43578220736.

The previous prime is 138905578649. The next prime is 138905578711. The reversal of 138905578698 is 896875509831.

138905578698 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680909598 + ... + 680909801.

It is an arithmetic number, because the mean of its divisors is an integer number (18384561900).

Almost surely, 2^138905578698 is an apocalyptic number.

138905578698 is an abundant number, since it is smaller than the sum of its proper divisors (155247411702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138905578698 is a wasteful number, since it uses less digits than its factorization.

138905578698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361819421.

The product of its (nonzero) digits is 130636800, while the sum is 69.

The spelling of 138905578698 in words is "one hundred thirty-eight billion, nine hundred five million, five hundred seventy-eight thousand, six hundred ninety-eight".