2051816880 has 80 divisors (see below), whose sum is σ = 6384305664. Its totient is φ = 545114880.

The previous prime is 2051816839. The next prime is 2051816909. The reversal of 2051816880 is 886181502.

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, 49267 + ... + 80813.

Almost surely, 2^2051816880 is an apocalyptic number.

2051816880 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 2051816880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3192152832).

2051816880 is an abundant number, since it is smaller than the sum of its proper divisors (4332488784).

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

2051816880 is a wasteful number, since it uses less digits than its factorization.

2051816880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31834 (or 31828 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 39.

The square root of 2051816880 is about 45296.9853301519. The cubic root of 2051816880 is about 1270.7092737614.

The spelling of 2051816880 in words is "two billion, fifty-one million, eight hundred sixteen thousand, eight hundred eighty".