128315838522555 has 24 divisors (see below), whose sum is σ = 223642927413360. Its totient is φ = 68057019322560.

The previous prime is 128315838522533. The next prime is 128315838522569. The reversal of 128315838522555 is 555225838513821.

128315838522555 is a `hidden beast` number, since 1 + 2 + 8 + 3 + 1 + 58 + 3 + 8 + 5 + 22 + 555 = 666.

It is not a de Polignac number, because 128315838522555 - 2¹⁶ = 128315838457019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128315838522492 and 128315838522501.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7876961685 + ... + 7876977974.

It is an arithmetic number, because the mean of its divisors is an integer number (9318455308890).

Almost surely, 2^{128315838522555} is an apocalyptic number.

128315838522555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128315838522555 is a deficient number, since it is larger than the sum of its proper divisors (95327088890805).

128315838522555 is a wasteful number, since it uses less digits than its factorization.

128315838522555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15753939851 (or 15753939848 counting only the distinct ones).

The product of its digits is 115200000, while the sum is 63.

The spelling of 128315838522555 in words is "one hundred twenty-eight trillion, three hundred fifteen billion, eight hundred thirty-eight million, five hundred twenty-two thousand, five hundred fifty-five".