128776456920417 has 16 divisors (see below), whose sum is σ = 181803964832640. Its totient is φ = 80800066144512.

The previous prime is 128776456920367. The next prime is 128776456920427. The reversal of 128776456920417 is 714029654677821.

It is not a de Polignac number, because 128776456920417 - 2¹⁸ = 128776456658273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128776456920427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8325133 + ... + 18079290.

It is an arithmetic number, because the mean of its divisors is an integer number (11362747802040).

Almost surely, 2^{128776456920417} is an apocalyptic number.

128776456920417 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128776456920417 is a deficient number, since it is larger than the sum of its proper divisors (53027507912223).

128776456920417 is a wasteful number, since it uses less digits than its factorization.

128776456920417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26500072.

The product of its (nonzero) digits is 284497920, while the sum is 69.

The spelling of 128776456920417 in words is "one hundred twenty-eight trillion, seven hundred seventy-six billion, four hundred fifty-six million, nine hundred twenty thousand, four hundred seventeen".