128650472777 has 2 divisors, whose sum is σ = 128650472778. Its totient is φ = 128650472776.

The previous prime is 128650472761. The next prime is 128650472779. The reversal of 128650472777 is 777274056821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122346747961 + 6303724816 = 349781^2 + 79396^2 .

It is a cyclic number.

It is not a de Polignac number, because 128650472777 - 2⁴ = 128650472761 is a prime.

Together with 128650472779, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128650472779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64325236388 + 64325236389.

It is an arithmetic number, because the mean of its divisors is an integer number (64325236389).

Almost surely, 2^128650472777 is an apocalyptic number.

It is an amenable number.

128650472777 is a deficient number, since it is larger than the sum of its proper divisors (1).

128650472777 is an equidigital number, since it uses as much as digits as its factorization.

128650472777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9219840, while the sum is 56.

The spelling of 128650472777 in words is "one hundred twenty-eight billion, six hundred fifty million, four hundred seventy-two thousand, seven hundred seventy-seven".