16605850661 has 16 divisors (see below), whose sum is σ = 17746511616. Its totient is φ = 15503195136.

The previous prime is 16605850633. The next prime is 16605850669.

16605850661 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 16605850661 - 2²⁶ = 16538741797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16605850669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199976 + ... + 270558.

It is an arithmetic number, because the mean of its divisors is an integer number (1109156976).

Almost surely, 2^16605850661 is an apocalyptic number.

It is an amenable number.

16605850661 is a deficient number, since it is larger than the sum of its proper divisors (1140660955).

16605850661 is a wasteful number, since it uses less digits than its factorization.

16605850661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70852.

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 16605850661 in words is "sixteen billion, six hundred five million, eight hundred fifty thousand, six hundred sixty-one".