2006660556 has 36 divisors (see below), whose sum is σ = 5074071912. Its totient is φ = 668665344.

The previous prime is 2006660549. The next prime is 2006660561. The reversal of 2006660556 is 6550666002.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2006660556.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129580 + ... + 144236.

It is an arithmetic number, because the mean of its divisors is an integer number (140946442).

Almost surely, 2^2006660556 is an apocalyptic number.

It is an amenable number.

2006660556 is an abundant number, since it is smaller than the sum of its proper divisors (3067411356).

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

2006660556 is a wasteful number, since it uses less digits than its factorization.

2006660556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18470 (or 18465 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 2006660556 is about 44795.7649337524. The cubic root of 2006660556 is about 1261.3181292712.

The spelling of 2006660556 in words is "two billion, six million, six hundred sixty thousand, five hundred fifty-six".