2005661042784 has 576 divisors, whose sum is σ = 6742519056000. Its totient is φ = 565253111808.

The previous prime is 2005661042771. The next prime is 2005661042837. The reversal of 2005661042784 is 4872401665002.

2005661042784 is a `hidden beast` number, since 2 + 0 + 0 + 5 + 6 + 610 + 4 + 27 + 8 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3940394722 + ... + 3940395230.

It is an arithmetic number, because the mean of its divisors is an integer number (11705762250).

Almost surely, 2^{2005661042784} is an apocalyptic number.

2005661042784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2005661042784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3371259528000).

2005661042784 is an abundant number, since it is smaller than the sum of its proper divisors (4736858013216).

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

2005661042784 is a wasteful number, since it uses less digits than its factorization.

2005661042784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012 (or 987 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The spelling of 2005661042784 in words is "two trillion, five billion, six hundred sixty-one million, forty-two thousand, seven hundred eighty-four".