2005066701666 has 48 divisors (see below), whose sum is σ = 5256981609984. Its totient is φ = 539177599872.

The previous prime is 2005066701647. The next prime is 2005066701679. The reversal of 2005066701666 is 6661076605002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 468033970 + ... + 468038253.

It is an arithmetic number, because the mean of its divisors is an integer number (109520450208).

Almost surely, 2^{2005066701666} is an apocalyptic number.

2005066701666 is an abundant number, since it is smaller than the sum of its proper divisors (3251914908318).

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

2005066701666 is a wasteful number, since it uses less digits than its factorization.

2005066701666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936072255 (or 936072252 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 2005066701666 in words is "two trillion, five billion, sixty-six million, seven hundred one thousand, six hundred sixty-six".