128910657755 has 16 divisors (see below), whose sum is σ = 174574936800. Its totient is φ = 90520335360.

The previous prime is 128910657751. The next prime is 128910657763. The reversal of 128910657755 is 557756019821.

It is not a de Polignac number, because 128910657755 - 2² = 128910657751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128910657755.

It is not an unprimeable number, because it can be changed into a prime (128910657751) 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, 40409270 + ... + 40412459.

It is an arithmetic number, because the mean of its divisors is an integer number (10910933550).

Almost surely, 2^128910657755 is an apocalyptic number.

128910657755 is a deficient number, since it is larger than the sum of its proper divisors (45664279045).

128910657755 is a wasteful number, since it uses less digits than its factorization.

128910657755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80821774.

The product of its (nonzero) digits is 5292000, while the sum is 56.

The spelling of 128910657755 in words is "one hundred twenty-eight billion, nine hundred ten million, six hundred fifty-seven thousand, seven hundred fifty-five".