128546438401 has 2 divisors, whose sum is σ = 128546438402. Its totient is φ = 128546438400.

The previous prime is 128546438389. The next prime is 128546438431. The reversal of 128546438401 is 104834645821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96960618225 + 31585820176 = 311385^2 + 177724^2 .

It is a cyclic number.

It is not a de Polignac number, because 128546438401 - 2⁵ = 128546438369 is a prime.

It is not a weakly prime, because it can be changed into another prime (128546438431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64273219200 + 64273219201.

It is an arithmetic number, because the mean of its divisors is an integer number (64273219201).

Almost surely, 2^128546438401 is an apocalyptic number.

It is an amenable number.

128546438401 is a deficient number, since it is larger than the sum of its proper divisors (1).

128546438401 is an equidigital number, since it uses as much as digits as its factorization.

128546438401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 737280, while the sum is 46.

The spelling of 128546438401 in words is "one hundred twenty-eight billion, five hundred forty-six million, four hundred thirty-eight thousand, four hundred one".