138557905825 has 24 divisors (see below), whose sum is σ = 179634484800. Its totient is φ = 105818391360.

The previous prime is 138557905823. The next prime is 138557905847. The reversal of 138557905825 is 528509755831.

It is not a de Polignac number, because 138557905825 - 2¹ = 138557905823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138557905825.

It is not an unprimeable number, because it can be changed into a prime (138557905823) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55966 + ... + 529384.

It is an arithmetic number, because the mean of its divisors is an integer number (7484770200).

Almost surely, 2^138557905825 is an apocalyptic number.

It is an amenable number.

138557905825 is a deficient number, since it is larger than the sum of its proper divisors (41076578975).

138557905825 is a wasteful number, since it uses less digits than its factorization.

138557905825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473961 (or 473956 counting only the distinct ones).

The product of its (nonzero) digits is 15120000, while the sum is 58.

The spelling of 138557905825 in words is "one hundred thirty-eight billion, five hundred fifty-seven million, nine hundred five thousand, eight hundred twenty-five".