128768370765791 has 4 divisors (see below), whose sum is σ = 128768393485512. Its totient is φ = 128768348046072.

The previous prime is 128768370765779. The next prime is 128768370765803. The reversal of 128768370765791 is 197567073867821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (128768370765779) and next prime (128768370765803).

It is a cyclic number.

It is not a de Polignac number, because 128768370765791 - 2¹⁴ = 128768370749407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128768370725791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4888976 + ... + 16776138.

It is an arithmetic number, because the mean of its divisors is an integer number (32192098371378).

Almost surely, 2^{128768370765791} is an apocalyptic number.

128768370765791 is a deficient number, since it is larger than the sum of its proper divisors (22719721).

128768370765791 is a wasteful number, since it uses less digits than its factorization.

128768370765791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22719720.

The product of its (nonzero) digits is 1493614080, while the sum is 77.

The spelling of 128768370765791 in words is "one hundred twenty-eight trillion, seven hundred sixty-eight billion, three hundred seventy million, seven hundred sixty-five thousand, seven hundred ninety-one".