2081156688 has 120 divisors (see below), whose sum is σ = 6284285280. Its totient is φ = 639141120.

The previous prime is 2081156683. The next prime is 2081156767. The reversal of 2081156688 is 8866511802.

2081156688 is a `hidden beast` number, since 2 + 0 + 8 + 1 + 1 + 566 + 88 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081156681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1907023 + ... + 1908113.

It is an arithmetic number, because the mean of its divisors is an integer number (52369044).

Almost surely, 2^2081156688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2081156688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3142142640).

2081156688 is an abundant number, since it is smaller than the sum of its proper divisors (4203128592).

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

2081156688 is a wasteful number, since it uses less digits than its factorization.

2081156688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2137 (or 2128 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The square root of 2081156688 is about 45619.6962725532. The cubic root of 2081156688 is about 1276.7374366333.

The spelling of 2081156688 in words is "two billion, eighty-one million, one hundred fifty-six thousand, six hundred eighty-eight".