128951085778555 has 32 divisors (see below), whose sum is σ = 156906376704000. Its totient is φ = 101721011438592.

The previous prime is 128951085778523. The next prime is 128951085778561. The reversal of 128951085778555 is 555877580159821.

It is a cyclic number.

It is not a de Polignac number, because 128951085778555 - 2⁵ = 128951085778523 is a prime.

It is a Smith number, since the sum of its digits (76) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 950555371 + ... + 950691019.

It is an arithmetic number, because the mean of its divisors is an integer number (4903324272000).

Almost surely, 2^{128951085778555} is an apocalyptic number.

128951085778555 is a deficient number, since it is larger than the sum of its proper divisors (27955290925445).

128951085778555 is a wasteful number, since it uses less digits than its factorization.

128951085778555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138883.

The product of its (nonzero) digits is 1411200000, while the sum is 76.

The spelling of 128951085778555 in words is "one hundred twenty-eight trillion, nine hundred fifty-one billion, eighty-five million, seven hundred seventy-eight thousand, five hundred fifty-five".