73128908189401 has 2 divisors, whose sum is σ = 73128908189402. Its totient is φ = 73128908189400.

The previous prime is 73128908189369. The next prime is 73128908189473. The reversal of 73128908189401 is 10498180982137.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61175846607001 + 11953061582400 = 7821499^2 + 3457320^2 .

It is a cyclic number.

It is not a de Polignac number, because 73128908189401 - 2⁵ = 73128908189369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 73128908189401.

It is not a weakly prime, because it can be changed into another prime (73128908189201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36564454094700 + 36564454094701.

It is an arithmetic number, because the mean of its divisors is an integer number (36564454094701).

Almost surely, 2^{73128908189401} is an apocalyptic number.

It is an amenable number.

73128908189401 is a deficient number, since it is larger than the sum of its proper divisors (1).

73128908189401 is an equidigital number, since it uses as much as digits as its factorization.

73128908189401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6967296, while the sum is 61.

The spelling of 73128908189401 in words is "seventy-three trillion, one hundred twenty-eight billion, nine hundred eight million, one hundred eighty-nine thousand, four hundred one".