138816856469 has 2 divisors, whose sum is σ = 138816856470. Its totient is φ = 138816856468.

The previous prime is 138816856433. The next prime is 138816856483. The reversal of 138816856469 is 964658618831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74031335569 + 64785520900 = 272087^2 + 254530^2 .

It is a cyclic number.

It is not a de Polignac number, because 138816856469 - 2¹⁶ = 138816790933 is a prime.

It is a super-2 number, since 2×138816856469² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138816856499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69408428234 + 69408428235.

It is an arithmetic number, because the mean of its divisors is an integer number (69408428235).

Almost surely, 2^138816856469 is an apocalyptic number.

It is an amenable number.

138816856469 is a deficient number, since it is larger than the sum of its proper divisors (1).

138816856469 is an equidigital number, since it uses as much as digits as its factorization.

138816856469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 59719680, while the sum is 65.

The spelling of 138816856469 in words is "one hundred thirty-eight billion, eight hundred sixteen million, eight hundred fifty-six thousand, four hundred sixty-nine".