128163081601 has 4 divisors (see below), whose sum is σ = 128234722900. Its totient is φ = 128091440304.

The previous prime is 128163081587. The next prime is 128163081623. The reversal of 128163081601 is 106180361821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53305574400 + 74857507201 = 230880^2 + 273601^2 .

It is a cyclic number.

It is not a de Polignac number, because 128163081601 - 2⁵ = 128163081569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128163081671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35817966 + ... + 35821543.

It is an arithmetic number, because the mean of its divisors is an integer number (32058680725).

Almost surely, 2^128163081601 is an apocalyptic number.

It is an amenable number.

128163081601 is a deficient number, since it is larger than the sum of its proper divisors (71641299).

128163081601 is an equidigital number, since it uses as much as digits as its factorization.

128163081601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71641298.

The product of its (nonzero) digits is 13824, while the sum is 37.

The spelling of 128163081601 in words is "one hundred twenty-eight billion, one hundred sixty-three million, eighty-one thousand, six hundred one".