2006551566 has 12 divisors (see below), whose sum is σ = 4347528432. Its totient is φ = 668850516.

The previous prime is 2006551559. The next prime is 2006551567. The reversal of 2006551566 is 6651556002.

It is a happy number.

2006551566 is a `hidden beast` number, since 20 + 0 + 65 + 515 + 66 = 666.

2006551566 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 2006551566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2006551567) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55737526 + ... + 55737561.

It is an arithmetic number, because the mean of its divisors is an integer number (362294036).

Almost surely, 2^2006551566 is an apocalyptic number.

2006551566 is an abundant number, since it is smaller than the sum of its proper divisors (2340976866).

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

2006551566 is a wasteful number, since it uses less digits than its factorization.

2006551566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111475095 (or 111475092 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 2006551566 is about 44794.5483959823. The cubic root of 2006551566 is about 1261.2952930635.

It can be divided in two parts, 20065 and 51566, that added together give a triangular number (71631 = T₃₇₈).

The spelling of 2006551566 in words is "two billion, six million, five hundred fifty-one thousand, five hundred sixty-six".