138550420255 has 32 divisors (see below), whose sum is σ = 181136088000. Its totient is φ = 101122931712.

The previous prime is 138550420243. The next prime is 138550420279. The reversal of 138550420255 is 552024055831.

It is a cyclic number.

It is not a de Polignac number, because 138550420255 - 2¹⁷ = 138550289183 is a prime.

It is a super-2 number, since 2×138550420255² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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, 25156212 + ... + 25161718.

It is an arithmetic number, because the mean of its divisors is an integer number (5660502750).

Almost surely, 2^138550420255 is an apocalyptic number.

138550420255 is a deficient number, since it is larger than the sum of its proper divisors (42585667745).

138550420255 is a wasteful number, since it uses less digits than its factorization.

138550420255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9963.

The product of its (nonzero) digits is 240000, while the sum is 40.

The spelling of 138550420255 in words is "one hundred thirty-eight billion, five hundred fifty million, four hundred twenty thousand, two hundred fifty-five".