128418520155 has 16 divisors (see below), whose sum is σ = 211022866464. Its totient is φ = 66638799360.

The previous prime is 128418520123. The next prime is 128418520193. The reversal of 128418520155 is 551025814821.

It is a happy number.

It is not a de Polignac number, because 128418520155 - 2⁵ = 128418520123 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115691806 + ... + 115692915.

It is an arithmetic number, because the mean of its divisors is an integer number (13188929154).

Almost surely, 2^128418520155 is an apocalyptic number.

128418520155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128418520155 is a deficient number, since it is larger than the sum of its proper divisors (82604346309).

128418520155 is a wasteful number, since it uses less digits than its factorization.

128418520155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231384766.

The product of its (nonzero) digits is 128000, while the sum is 42.

The spelling of 128418520155 in words is "one hundred twenty-eight billion, four hundred eighteen million, five hundred twenty thousand, one hundred fifty-five".