128016555 has 24 divisors (see below), whose sum is σ = 209985456. Its totient is φ = 66597120.

The previous prime is 128016541. The next prime is 128016569. The reversal of 128016555 is 555610821.

It is an interprime number because it is at equal distance from previous prime (128016541) and next prime (128016569).

It is not a de Polignac number, because 128016555 - 2⁸ = 128016299 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22677 + ... + 27753.

It is an arithmetic number, because the mean of its divisors is an integer number (8749394).

Almost surely, 2^128016555 is an apocalyptic number.

128016555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128016555 is a deficient number, since it is larger than the sum of its proper divisors (81968901).

128016555 is an equidigital number, since it uses as much as digits as its factorization.

128016555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5167 (or 5126 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 33.

The square root of 128016555 is about 11314.4401098773. The cubic root of 128016555 is about 503.9901460973.

The spelling of 128016555 in words is "one hundred twenty-eight million, sixteen thousand, five hundred fifty-five".