138816856433 has 2 divisors, whose sum is σ = 138816856434. Its totient is φ = 138816856432.

The previous prime is 138816856417. The next prime is 138816856469. The reversal of 138816856433 is 334658618831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131785698529 + 7031157904 = 363023^2 + 83852^2 .

It is an emirp because it is prime and its reverse (334658618831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138816856433 - 2⁴ = 138816856417 is a prime.

It is not a weakly prime, because it can be changed into another prime (138816856483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69408428216 + 69408428217.

It is an arithmetic number, because the mean of its divisors is an integer number (69408428217).

Almost surely, 2^138816856433 is an apocalyptic number.

It is an amenable number.

138816856433 is a deficient number, since it is larger than the sum of its proper divisors (1).

138816856433 is an equidigital number, since it uses as much as digits as its factorization.

138816856433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9953280, while the sum is 56.

The spelling of 138816856433 in words is "one hundred thirty-eight billion, eight hundred sixteen million, eight hundred fifty-six thousand, four hundred thirty-three".