16566083481 has 4 divisors (see below), whose sum is σ = 22088111312. Its totient is φ = 11044055652.

The previous prime is 16566083473. The next prime is 16566083509. The reversal of 16566083481 is 18438066561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16566083481 - 2³ = 16566083473 is a prime.

It is a super-2 number, since 2×16566083481² (a number of 21 digits) contains 22 as substring.

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 16566083481.

It is not an unprimeable number, because it can be changed into a prime (16566083881) 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, 2761013911 + ... + 2761013916.

It is an arithmetic number, because the mean of its divisors is an integer number (5522027828).

Almost surely, 2^16566083481 is an apocalyptic number.

It is an amenable number.

16566083481 is a deficient number, since it is larger than the sum of its proper divisors (5522027831).

16566083481 is an equidigital number, since it uses as much as digits as its factorization.

16566083481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5522027830.

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 16566083481 in words is "sixteen billion, five hundred sixty-six million, eighty-three thousand, four hundred eighty-one".