138730256563 has 4 divisors (see below), whose sum is σ = 140486335840. Its totient is φ = 136974177288.

The previous prime is 138730256543. The next prime is 138730256573. The reversal of 138730256563 is 365652037831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138730256563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138730256543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 878039520 + ... + 878039677.

It is an arithmetic number, because the mean of its divisors is an integer number (35121583960).

Almost surely, 2^138730256563 is an apocalyptic number.

138730256563 is a deficient number, since it is larger than the sum of its proper divisors (1756079277).

138730256563 is an equidigital number, since it uses as much as digits as its factorization.

138730256563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756079276.

The product of its (nonzero) digits is 2721600, while the sum is 49.

The spelling of 138730256563 in words is "one hundred thirty-eight billion, seven hundred thirty million, two hundred fifty-six thousand, five hundred sixty-three".