138366346961 has 2 divisors, whose sum is σ = 138366346962. Its totient is φ = 138366346960.

The previous prime is 138366346933. The next prime is 138366346969. The reversal of 138366346961 is 169643663831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108187708561 + 30178638400 = 328919^2 + 173720^2 .

It is a cyclic number.

It is not a de Polignac number, because 138366346961 - 2¹⁸ = 138366084817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138366346897 and 138366346906.

It is not a weakly prime, because it can be changed into another prime (138366346969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69183173480 + 69183173481.

It is an arithmetic number, because the mean of its divisors is an integer number (69183173481).

Almost surely, 2^138366346961 is an apocalyptic number.

It is an amenable number.

138366346961 is a deficient number, since it is larger than the sum of its proper divisors (1).

138366346961 is an equidigital number, since it uses as much as digits as its factorization.

138366346961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10077696, while the sum is 56.

The spelling of 138366346961 in words is "one hundred thirty-eight billion, three hundred sixty-six million, three hundred forty-six thousand, nine hundred sixty-one".