138256968947 has 2 divisors, whose sum is σ = 138256968948. Its totient is φ = 138256968946.

The previous prime is 138256968853. The next prime is 138256968961. The reversal of 138256968947 is 749869652831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138256968947 - 2³² = 133962001651 is a prime.

It is a super-2 number, since 2×138256968947² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138256968247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69128484473 + 69128484474.

It is an arithmetic number, because the mean of its divisors is an integer number (69128484474).

Almost surely, 2^138256968947 is an apocalyptic number.

138256968947 is a deficient number, since it is larger than the sum of its proper divisors (1).

138256968947 is an equidigital number, since it uses as much as digits as its factorization.

138256968947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 156764160, while the sum is 68.

The spelling of 138256968947 in words is "one hundred thirty-eight billion, two hundred fifty-six million, nine hundred sixty-eight thousand, nine hundred forty-seven".