1665000561606 has 16 divisors (see below), whose sum is σ = 3330102067200. Its totient is φ = 554983363208.

The previous prime is 1665000561589. The next prime is 1665000561643. The reversal of 1665000561606 is 6061650005661.

It is a congruent number.

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, 3990726 + ... + 4388153.

It is an arithmetic number, because the mean of its divisors is an integer number (208131379200).

Almost surely, 2^{1665000561606} is an apocalyptic number.

1665000561606 is an abundant number, since it is smaller than the sum of its proper divisors (1665101505594).

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

1665000561606 is a wasteful number, since it uses less digits than its factorization.

1665000561606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8412003.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 1665000561606 in words is "one trillion, six hundred sixty-five billion, five hundred sixty-one thousand, six hundred six".