138843272651 has 2 divisors, whose sum is σ = 138843272652. Its totient is φ = 138843272650.

The previous prime is 138843272563. The next prime is 138843272677. The reversal of 138843272651 is 156272348831.

It is a strong prime.

It is an emirp because it is prime and its reverse (156272348831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138843272651 - 2²⁶ = 138776163787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138843272651.

It is not a weakly prime, because it can be changed into another prime (138843272251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69421636325 + 69421636326.

It is an arithmetic number, because the mean of its divisors is an integer number (69421636326).

Almost surely, 2^138843272651 is an apocalyptic number.

138843272651 is a deficient number, since it is larger than the sum of its proper divisors (1).

138843272651 is an equidigital number, since it uses as much as digits as its factorization.

138843272651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 50.

The spelling of 138843272651 in words is "one hundred thirty-eight billion, eight hundred forty-three million, two hundred seventy-two thousand, six hundred fifty-one".