138665420563 has 2 divisors, whose sum is σ = 138665420564. Its totient is φ = 138665420562.

The previous prime is 138665420527. The next prime is 138665420617. The reversal of 138665420563 is 365024566831.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138665420563 is a prime.

It is not a weakly prime, because it can be changed into another prime (138665420863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69332710281 + 69332710282.

It is an arithmetic number, because the mean of its divisors is an integer number (69332710282).

Almost surely, 2^138665420563 is an apocalyptic number.

138665420563 is a deficient number, since it is larger than the sum of its proper divisors (1).

138665420563 is an equidigital number, since it uses as much as digits as its factorization.

138665420563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 138665420563 in words is "one hundred thirty-eight billion, six hundred sixty-five million, four hundred twenty thousand, five hundred sixty-three".