138553655 has 16 divisors (see below), whose sum is σ = 178679520. Its totient is φ = 102761472.

The previous prime is 138553651. The next prime is 138553669. The reversal of 138553655 is 556355831.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 138553655 - 2² = 138553651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138553651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6470 + ... + 17859.

It is an arithmetic number, because the mean of its divisors is an integer number (11167470).

Almost surely, 2^138553655 is an apocalyptic number.

138553655 is a deficient number, since it is larger than the sum of its proper divisors (40125865).

138553655 is a wasteful number, since it uses less digits than its factorization.

138553655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24418.

The product of its digits is 270000, while the sum is 41.

The square root of 138553655 is about 11770.8816577179. The cubic root of 138553655 is about 517.4550887923.

The spelling of 138553655 in words is "one hundred thirty-eight million, five hundred fifty-three thousand, six hundred fifty-five".