128862308777 has 2 divisors, whose sum is σ = 128862308778. Its totient is φ = 128862308776.

The previous prime is 128862308767. The next prime is 128862308779. The reversal of 128862308777 is 777803268821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120031759936 + 8830548841 = 346456^2 + 93971^2 .

It is a cyclic number.

It is not a de Polignac number, because 128862308777 - 2¹⁸ = 128862046633 is a prime.

Together with 128862308779, 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 (128862308779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64431154388 + 64431154389.

It is an arithmetic number, because the mean of its divisors is an integer number (64431154389).

Almost surely, 2^128862308777 is an apocalyptic number.

It is an amenable number.

128862308777 is a deficient number, since it is larger than the sum of its proper divisors (1).

128862308777 is an equidigital number, since it uses as much as digits as its factorization.

128862308777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12644352, while the sum is 59.

The spelling of 128862308777 in words is "one hundred twenty-eight billion, eight hundred sixty-two million, three hundred eight thousand, seven hundred seventy-seven".