128768001281 has 2 divisors, whose sum is σ = 128768001282. Its totient is φ = 128768001280.

The previous prime is 128768001251. The next prime is 128768001331. The reversal of 128768001281 is 182100867821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126917625025 + 1850376256 = 356255^2 + 43016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128768001281 is a prime.

It is a super-2 number, since 2×128768001281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128768001251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64384000640 + 64384000641.

It is an arithmetic number, because the mean of its divisors is an integer number (64384000641).

Almost surely, 2^128768001281 is an apocalyptic number.

It is an amenable number.

128768001281 is a deficient number, since it is larger than the sum of its proper divisors (1).

128768001281 is an equidigital number, since it uses as much as digits as its factorization.

128768001281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86016, while the sum is 44.

The spelling of 128768001281 in words is "one hundred twenty-eight billion, seven hundred sixty-eight million, one thousand, two hundred eighty-one".