2155041680 has 80 divisors (see below), whose sum is σ = 5476042368. Its totient is φ = 782208000.

The previous prime is 2155041673. The next prime is 2155041743. The reversal of 2155041680 is 861405512.

It is a tau number, because it is divible by the number of its divisors (80).

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, 553340 + ... + 557220.

Almost surely, 2^2155041680 is an apocalyptic number.

2155041680 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 2155041680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2738021184).

2155041680 is an abundant number, since it is smaller than the sum of its proper divisors (3321000688).

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

2155041680 is a wasteful number, since it uses less digits than its factorization.

2155041680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4536 (or 4530 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 2155041680 is about 46422.4264768657. The cubic root of 2155041680 is about 1291.6709472676.

The spelling of 2155041680 in words is "two billion, one hundred fifty-five million, forty-one thousand, six hundred eighty".