128231620577 has 2 divisors, whose sum is σ = 128231620578. Its totient is φ = 128231620576.

The previous prime is 128231620571. The next prime is 128231620607. The reversal of 128231620577 is 775026132821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69497613376 + 58734007201 = 263624^2 + 242351^2 .

It is an emirp because it is prime and its reverse (775026132821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128231620577 - 2⁶ = 128231620513 is a prime.

It is not a weakly prime, because it can be changed into another prime (128231620571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64115810288 + 64115810289.

It is an arithmetic number, because the mean of its divisors is an integer number (64115810289).

Almost surely, 2^128231620577 is an apocalyptic number.

It is an amenable number.

128231620577 is a deficient number, since it is larger than the sum of its proper divisors (1).

128231620577 is an equidigital number, since it uses as much as digits as its factorization.

128231620577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 128231620577 in words is "one hundred twenty-eight billion, two hundred thirty-one million, six hundred twenty thousand, five hundred seventy-seven".