2155554120 has 128 divisors (see below), whose sum is σ = 6563773440. Its totient is φ = 566246400.

The previous prime is 2155554113. The next prime is 2155554139. The reversal of 2155554120 is 214555512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3550857 + ... + 3551463.

It is an arithmetic number, because the mean of its divisors is an integer number (51279480).

Almost surely, 2^2155554120 is an apocalyptic number.

2155554120 is a gapful number since it is divisible by the number (20) 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 2155554120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3281886720).

2155554120 is an abundant number, since it is smaller than the sum of its proper divisors (4408219320).

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

2155554120 is a wasteful number, since it uses less digits than its factorization.

2155554120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015 (or 1011 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 30.

The square root of 2155554120 is about 46427.9454639121. The cubic root of 2155554120 is about 1291.7733198279.

The spelling of 2155554120 in words is "two billion, one hundred fifty-five million, five hundred fifty-four thousand, one hundred twenty".