138175992569 has 2 divisors, whose sum is σ = 138175992570. Its totient is φ = 138175992568.

The previous prime is 138175992553. The next prime is 138175992589. The reversal of 138175992569 is 965299571831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79757102569 + 58418890000 = 282413^2 + 241700^2 .

It is a cyclic number.

It is not a de Polignac number, because 138175992569 - 2⁴ = 138175992553 is a prime.

It is a super-2 number, since 2×138175992569² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138175992529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69087996284 + 69087996285.

It is an arithmetic number, because the mean of its divisors is an integer number (69087996285).

Almost surely, 2^138175992569 is an apocalyptic number.

It is an amenable number.

138175992569 is a deficient number, since it is larger than the sum of its proper divisors (1).

138175992569 is an equidigital number, since it uses as much as digits as its factorization.

138175992569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36741600, while the sum is 65.

The spelling of 138175992569 in words is "one hundred thirty-eight billion, one hundred seventy-five million, nine hundred ninety-two thousand, five hundred sixty-nine".