138553355533 has 2 divisors, whose sum is σ = 138553355534. Its totient is φ = 138553355532.

The previous prime is 138553355519. The next prime is 138553355557. The reversal of 138553355533 is 335553355831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72901080004 + 65652275529 = 270002^2 + 256227^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138553355533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138553355933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69276677766 + 69276677767.

It is an arithmetic number, because the mean of its divisors is an integer number (69276677767).

Almost surely, 2^138553355533 is an apocalyptic number.

It is an amenable number.

138553355533 is a deficient number, since it is larger than the sum of its proper divisors (1).

138553355533 is an equidigital number, since it uses as much as digits as its factorization.

138553355533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6075000, while the sum is 49.

The spelling of 138553355533 in words is "one hundred thirty-eight billion, five hundred fifty-three million, three hundred fifty-five thousand, five hundred thirty-three".