138404128555 has 32 divisors (see below), whose sum is σ = 207158814720. Its totient is φ = 86239624320.

The previous prime is 138404128531. The next prime is 138404128567. The reversal of 138404128555 is 555821404831.

It is not a de Polignac number, because 138404128555 - 2⁹ = 138404128043 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 801901 + ... + 959089.

It is an arithmetic number, because the mean of its divisors is an integer number (6473712960).

Almost surely, 2^138404128555 is an apocalyptic number.

138404128555 is a deficient number, since it is larger than the sum of its proper divisors (68754686165).

138404128555 is a wasteful number, since it uses less digits than its factorization.

138404128555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159499.

The product of its (nonzero) digits is 768000, while the sum is 46.

The spelling of 138404128555 in words is "one hundred thirty-eight billion, four hundred four million, one hundred twenty-eight thousand, five hundred fifty-five".