2005635666 has 16 divisors (see below), whose sum is σ = 4011801984. Its totient is φ = 668456784.

The previous prime is 2005635623. The next prime is 2005635677. The reversal of 2005635666 is 6665365002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40791 + ... + 75333.

It is an arithmetic number, because the mean of its divisors is an integer number (250737624).

Almost surely, 2^2005635666 is an apocalyptic number.

2005635666 is an abundant number, since it is smaller than the sum of its proper divisors (2006166318).

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

2005635666 is a wasteful number, since it uses less digits than its factorization.

2005635666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44225.

The product of its (nonzero) digits is 194400, while the sum is 39.

The square root of 2005635666 is about 44784.3238868245. The cubic root of 2005635666 is about 1261.1033557797.

The spelling of 2005635666 in words is "two billion, five million, six hundred thirty-five thousand, six hundred sixty-six".