16605006501666 has 32 divisors (see below), whose sum is σ = 38135900102400. Its totient is φ = 4766987512080.

The previous prime is 16605006501653. The next prime is 16605006501689. The reversal of 16605006501666 is 66610560050661.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6620814736 + ... + 6620817243.

It is an arithmetic number, because the mean of its divisors is an integer number (1191746878200).

Almost surely, 2^{16605006501666} is an apocalyptic number.

16605006501666 is an abundant number, since it is smaller than the sum of its proper divisors (21530893600734).

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

16605006501666 is a wasteful number, since it uses less digits than its factorization.

16605006501666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13241632014.

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 16605006501666 in words is "sixteen trillion, six hundred five billion, six million, five hundred one thousand, six hundred sixty-six".