16566531417 has 12 divisors (see below), whose sum is σ = 23976453540. Its totient is φ = 11022653088.

The previous prime is 16566531389. The next prime is 16566531427. The reversal of 16566531417 is 71413566561.

16566531417 is a `hidden beast` number, since 16 + 5 + 66 + 531 + 41 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5762176281 + 10804355136 = 75909^2 + 103944^2 .

It is not a de Polignac number, because 16566531417 - 2¹⁴ = 16566515033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16566531427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1803598 + ... + 1812759.

It is an arithmetic number, because the mean of its divisors is an integer number (1998037795).

Almost surely, 2^16566531417 is an apocalyptic number.

It is an amenable number.

16566531417 is a deficient number, since it is larger than the sum of its proper divisors (7409922123).

16566531417 is a wasteful number, since it uses less digits than its factorization.

16566531417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3616872 (or 3616869 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The spelling of 16566531417 in words is "sixteen billion, five hundred sixty-six million, five hundred thirty-one thousand, four hundred seventeen".