128155873550 has 48 divisors (see below), whose sum is σ = 246984169680. Its totient is φ = 49442615040.

The previous prime is 128155873543. The next prime is 128155873577. The reversal of 128155873550 is 55378551821.

128155873550 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

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, 253487 + ... + 566186.

It is an arithmetic number, because the mean of its divisors is an integer number (5145503535).

Almost surely, 2^128155873550 is an apocalyptic number.

128155873550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128155873550 is a deficient number, since it is larger than the sum of its proper divisors (118828296130).

128155873550 is a wasteful number, since it uses less digits than its factorization.

128155873550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819797 (or 819792 counting only the distinct ones).

The product of its (nonzero) digits is 1680000, while the sum is 50.

The spelling of 128155873550 in words is "one hundred twenty-eight billion, one hundred fifty-five million, eight hundred seventy-three thousand, five hundred fifty".