128066401 has 2 divisors, whose sum is σ = 128066402. Its totient is φ = 128066400.

The previous prime is 128066387. The next prime is 128066417. The reversal of 128066401 is 104660821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106915600 + 21150801 = 10340^2 + 4599^2 .

It is a cyclic number.

It is not a de Polignac number, because 128066401 - 2¹¹ = 128064353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128066401.

It is not a weakly prime, because it can be changed into another prime (128066201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64033200 + 64033201.

It is an arithmetic number, because the mean of its divisors is an integer number (64033201).

Almost surely, 2^128066401 is an apocalyptic number.

It is an amenable number.

128066401 is a deficient number, since it is larger than the sum of its proper divisors (1).

128066401 is an equidigital number, since it uses as much as digits as its factorization.

128066401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 128066401 is about 11316.6426558410. The cubic root of 128066401 is about 504.0555507448.

The spelling of 128066401 in words is "one hundred twenty-eight million, sixty-six thousand, four hundred one".