138987655073 has 2 divisors, whose sum is σ = 138987655074. Its totient is φ = 138987655072.

The previous prime is 138987655067. The next prime is 138987655129. The reversal of 138987655073 is 370556789831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134665513024 + 4322142049 = 366968^2 + 65743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138987655073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138987654997 and 138987655015.

It is not a weakly prime, because it can be changed into another prime (138987655013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69493827536 + 69493827537.

It is an arithmetic number, because the mean of its divisors is an integer number (69493827537).

Almost surely, 2^138987655073 is an apocalyptic number.

It is an amenable number.

138987655073 is a deficient number, since it is larger than the sum of its proper divisors (1).

138987655073 is an equidigital number, since it uses as much as digits as its factorization.

138987655073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38102400, while the sum is 62.

The spelling of 138987655073 in words is "one hundred thirty-eight billion, nine hundred eighty-seven million, six hundred fifty-five thousand, seventy-three".