128177445855 has 16 divisors (see below), whose sum is σ = 205840687104. Its totient is φ = 68109046560.

The previous prime is 128177445833. The next prime is 128177445863. The reversal of 128177445855 is 558544771821.

It is not a de Polignac number, because 128177445855 - 2⁶ = 128177445791 is a prime.

It is a super-2 number, since 2×128177445855² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128177445795 and 128177445804.

It is a congruent number.

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, 15761919 + ... + 15770048.

It is an arithmetic number, because the mean of its divisors is an integer number (12865042944).

Almost surely, 2^128177445855 is an apocalyptic number.

128177445855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128177445855 is a deficient number, since it is larger than the sum of its proper divisors (77663241249).

128177445855 is a wasteful number, since it uses less digits than its factorization.

128177445855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31532246.

The product of its digits is 12544000, while the sum is 57.

The spelling of 128177445855 in words is "one hundred twenty-eight billion, one hundred seventy-seven million, four hundred forty-five thousand, eight hundred fifty-five".