2043640566 has 96 divisors (see below), whose sum is σ = 4945195008. Its totient is φ = 604739520.

The previous prime is 2043640561. The next prime is 2043640579. The reversal of 2043640566 is 6650463402.

2043640566 is a `hidden beast` number, since 2 + 0 + 4 + 3 + 640 + 5 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 2043640566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2043640561) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1684176 + ... + 1685388.

It is an arithmetic number, because the mean of its divisors is an integer number (51512448).

Almost surely, 2^2043640566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2043640566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2472597504).

2043640566 is an abundant number, since it is smaller than the sum of its proper divisors (2901554442).

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

2043640566 is a wasteful number, since it uses less digits than its factorization.

2043640566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426 (or 1423 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 2043640566 is about 45206.6429410546. The cubic root of 2043640566 is about 1269.0191376562.

The spelling of 2043640566 in words is "two billion, forty-three million, six hundred forty thousand, five hundred sixty-six".