16566306612773 has 4 divisors (see below), whose sum is σ = 16637406641388. Its totient is φ = 16495206584160.

The previous prime is 16566306612701. The next prime is 16566306612781. The reversal of 16566306612773 is 37721660366561.

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 5980406667169 + 10585899945604 = 2445487^2 + 3253598^2 .

It is a cyclic number.

It is not a de Polignac number, because 16566306612773 - 2²⁸ = 16566038177317 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 (16566306612073) 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, 35550013958 + ... + 35550014423.

It is an arithmetic number, because the mean of its divisors is an integer number (4159351660347).

Almost surely, 2^{16566306612773} is an apocalyptic number.

It is an amenable number.

16566306612773 is a deficient number, since it is larger than the sum of its proper divisors (71100028615).

16566306612773 is an equidigital number, since it uses as much as digits as its factorization.

16566306612773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71100028614.

The product of its (nonzero) digits is 34292160, while the sum is 59.

The spelling of 16566306612773 in words is "sixteen trillion, five hundred sixty-six billion, three hundred six million, six hundred twelve thousand, seven hundred seventy-three".