16566105321541 has 4 divisors (see below), whose sum is σ = 16603000879500. Its totient is φ = 16529209763584.

The previous prime is 16566105321529. The next prime is 16566105321547. The reversal of 16566105321541 is 14512350166561.

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 7540461080100 + 9025644241441 = 2745990^2 + 3004271^2 .

It is a cyclic number.

It is not a de Polignac number, because 16566105321541 - 2²¹ = 16566103224389 is a prime.

It is a super-2 number, since 2×16566105321541² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16566105321491 and 16566105321500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16566105321547) 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, 18447778306 + ... + 18447779203.

It is an arithmetic number, because the mean of its divisors is an integer number (4150750219875).

Almost surely, 2^{16566105321541} is an apocalyptic number.

It is an amenable number.

16566105321541 is a deficient number, since it is larger than the sum of its proper divisors (36895557959).

16566105321541 is an equidigital number, since it uses as much as digits as its factorization.

16566105321541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36895557958.

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 16566105321541 in words is "sixteen trillion, five hundred sixty-six billion, one hundred five million, three hundred twenty-one thousand, five hundred forty-one".