2081581623 has 24 divisors (see below), whose sum is σ = 3292214016. Its totient is φ = 1256893200.

The previous prime is 2081581577. The next prime is 2081581639. The reversal of 2081581623 is 3261851802.

It is a happy number.

2081581623 is a `hidden beast` number, since 20 + 8 + 1 + 5 + 8 + 1 + 623 = 666.

2081581623 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2081581623 - 2⁶ = 2081581559 is a prime.

It is a super-2 number, since 2×2081581623² = 8665964106422628258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081581123) 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, 11965 + ... + 65622.

It is an arithmetic number, because the mean of its divisors is an integer number (137175584).

Almost surely, 2^2081581623 is an apocalyptic number.

2081581623 is a deficient number, since it is larger than the sum of its proper divisors (1210632393).

2081581623 is a wasteful number, since it uses less digits than its factorization.

2081581623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77875 (or 77872 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 2081581623 is about 45624.3533981579. The cubic root of 2081581623 is about 1276.8243263751.

The spelling of 2081581623 in words is "two billion, eighty-one million, five hundred eighty-one thousand, six hundred twenty-three".