138805288961 has 2 divisors, whose sum is σ = 138805288962. Its totient is φ = 138805288960.

The previous prime is 138805288901. The next prime is 138805288969. The reversal of 138805288961 is 169882508831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77030671936 + 61774617025 = 277544^2 + 248545^2 .

It is a cyclic number.

It is not a de Polignac number, because 138805288961 - 2¹⁴ = 138805272577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138805288961.

It is not a weakly prime, because it can be changed into another prime (138805288969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69402644480 + 69402644481.

It is an arithmetic number, because the mean of its divisors is an integer number (69402644481).

Almost surely, 2^138805288961 is an apocalyptic number.

It is an amenable number.

138805288961 is a deficient number, since it is larger than the sum of its proper divisors (1).

138805288961 is an equidigital number, since it uses as much as digits as its factorization.

138805288961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6635520, while the sum is 59.

The spelling of 138805288961 in words is "one hundred thirty-eight billion, eight hundred five million, two hundred eighty-eight thousand, nine hundred sixty-one".