138691035255 has 16 divisors (see below), whose sum is σ = 221990772960. Its totient is φ = 73940179968.

The previous prime is 138691035187. The next prime is 138691035289. The reversal of 138691035255 is 552530196831.

It is a happy number.

It is not a de Polignac number, because 138691035255 - 2¹⁰ = 138691034231 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1732822 + ... + 1811091.

It is an arithmetic number, because the mean of its divisors is an integer number (13874423310).

Almost surely, 2^138691035255 is an apocalyptic number.

138691035255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138691035255 is a deficient number, since it is larger than the sum of its proper divisors (83299737705).

138691035255 is a wasteful number, since it uses less digits than its factorization.

138691035255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3546530.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 138691035255 in words is "one hundred thirty-eight billion, six hundred ninety-one million, thirty-five thousand, two hundred fifty-five".