128423117155 has 8 divisors (see below), whose sum is σ = 154111756752. Its totient is φ = 102735816288.

The previous prime is 128423117099. The next prime is 128423117167. The reversal of 128423117155 is 551711324821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128423117155 - 2³¹ = 126275633507 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109912 + ... + 518581.

It is an arithmetic number, because the mean of its divisors is an integer number (19263969594).

Almost surely, 2^128423117155 is an apocalyptic number.

128423117155 is a deficient number, since it is larger than the sum of its proper divisors (25688639597).

128423117155 is an equidigital number, since it uses as much as digits as its factorization.

128423117155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669365.

The product of its digits is 67200, while the sum is 40.

The spelling of 128423117155 in words is "one hundred twenty-eight billion, four hundred twenty-three million, one hundred seventeen thousand, one hundred fifty-five".