155855212128 has 384 divisors, whose sum is σ = 585036103680. Its totient is φ = 39175488000.

The previous prime is 155855212109. The next prime is 155855212129. The reversal of 155855212128 is 821212558551.

155855212128 is a `hidden beast` number, since 1 + 5 + 5 + 85 + 521 + 21 + 28 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155855212129) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2024583 + ... + 2100153.

It is an arithmetic number, because the mean of its divisors is an integer number (1523531520).

Almost surely, 2^155855212128 is an apocalyptic number.

155855212128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155855212128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292518051840).

155855212128 is an abundant number, since it is smaller than the sum of its proper divisors (429180891552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155855212128 is a wasteful number, since it uses less digits than its factorization.

155855212128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75639 (or 75625 counting only the distinct ones).

The product of its digits is 320000, while the sum is 45.

The spelling of 155855212128 in words is "one hundred fifty-five billion, eight hundred fifty-five million, two hundred twelve thousand, one hundred twenty-eight".