128690798177 has 2 divisors, whose sum is σ = 128690798178. Its totient is φ = 128690798176.

The previous prime is 128690798153. The next prime is 128690798209. The reversal of 128690798177 is 771897096821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77415271696 + 51275526481 = 278236^2 + 226441^2 .

It is an emirp because it is prime and its reverse (771897096821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128690798177 - 2¹⁶ = 128690732641 is a prime.

It is a super-2 number, since 2×128690798177² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128690792177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64345399088 + 64345399089.

It is an arithmetic number, because the mean of its divisors is an integer number (64345399089).

Almost surely, 2^128690798177 is an apocalyptic number.

It is an amenable number.

128690798177 is a deficient number, since it is larger than the sum of its proper divisors (1).

128690798177 is an equidigital number, since it uses as much as digits as its factorization.

128690798177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21337344, while the sum is 65.

The spelling of 128690798177 in words is "one hundred twenty-eight billion, six hundred ninety million, seven hundred ninety-eight thousand, one hundred seventy-seven".