138909399553 has 6 divisors (see below), whose sum is σ = 145211527874. Its totient is φ = 132869859936.

The previous prime is 138909399547. The next prime is 138909399569. The reversal of 138909399553 is 355993909831.

It can be written as a sum of positive squares in only one way, i.e., 71169967729 + 67739431824 = 266777^2 + 260268^2 .

It is not a de Polignac number, because 138909399553 - 2⁵ = 138909399521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138909399593) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 131293800 + ... + 131294857.

Almost surely, 2^138909399553 is an apocalyptic number.

It is an amenable number.

138909399553 is a deficient number, since it is larger than the sum of its proper divisors (6302128321).

138909399553 is an equidigital number, since it uses as much as digits as its factorization.

138909399553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262588703 (or 262588680 counting only the distinct ones).

The product of its (nonzero) digits is 35429400, while the sum is 64.

The spelling of 138909399553 in words is "one hundred thirty-eight billion, nine hundred nine million, three hundred ninety-nine thousand, five hundred fifty-three".