16605545893 has 4 divisors (see below), whose sum is σ = 16634325580. Its totient is φ = 16576766208.

The previous prime is 16605545849. The next prime is 16605545909. The reversal of 16605545893 is 39854550661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15599260609 + 1006285284 = 124897^2 + 31722^2 .

It is a cyclic number.

It is not a de Polignac number, because 16605545893 - 2¹⁷ = 16605414821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16605545893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16605545393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14388978 + ... + 14390131.

It is an arithmetic number, because the mean of its divisors is an integer number (4158581395).

Almost surely, 2^16605545893 is an apocalyptic number.

It is an amenable number.

16605545893 is a deficient number, since it is larger than the sum of its proper divisors (28779687).

16605545893 is an equidigital number, since it uses as much as digits as its factorization.

16605545893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28779686.

The product of its (nonzero) digits is 3888000, while the sum is 52.

The spelling of 16605545893 in words is "sixteen billion, six hundred five million, five hundred forty-five thousand, eight hundred ninety-three".