2155323030144 has 128 divisors (see below), whose sum is σ = 5824450756800. Its totient is φ = 705980350464.

The previous prime is 2155323030139. The next prime is 2155323030163. The reversal of 2155323030144 is 4410303235512.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×2155323030144² (a number of 25 digits) contains 22 as substring.

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, 60632344 + ... + 60667880.

Almost surely, 2^{2155323030144} is an apocalyptic number.

2155323030144 is a gapful number since it is divisible by the number (24) 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 2155323030144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2912225378400).

2155323030144 is an abundant number, since it is smaller than the sum of its proper divisors (3669127726656).

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

2155323030144 is a wasteful number, since it uses less digits than its factorization.

2155323030144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38290 (or 38278 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 2155323030144 its reverse (4410303235512), we get a palindrome (6565626265656).

The spelling of 2155323030144 in words is "two trillion, one hundred fifty-five billion, three hundred twenty-three million, thirty thousand, one hundred forty-four".