2005606655 has 48 divisors (see below), whose sum is σ = 2796210720. Its totient is φ = 1376054784.

The previous prime is 2005606639. The next prime is 2005606661. The reversal of 2005606655 is 5566065002.

It is a Cunningham number, because it is equal to 44784²-1.

It is not a de Polignac number, because 2005606655 - 2⁴ = 2005606639 is a prime.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 849737 + ... + 852093.

It is an arithmetic number, because the mean of its divisors is an integer number (58254390).

Almost surely, 2^2005606655 is an apocalyptic number.

2005606655 is a deficient number, since it is larger than the sum of its proper divisors (790604065).

2005606655 is a wasteful number, since it uses less digits than its factorization.

2005606655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2460 (or 2447 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 2005606655 is about 44783.9999888353. Note that the first 4 decimals coincide. The cubic root of 2005606655 is about 1261.0972752393.

The spelling of 2005606655 in words is "two billion, five million, six hundred six thousand, six hundred fifty-five".