16566769225 has 6 divisors (see below), whose sum is σ = 20542793870. Its totient is φ = 13253415360.

The previous prime is 16566769213. The next prime is 16566769231. The reversal of 16566769225 is 52296766561.

It can be written as a sum of positive squares in 3 ways, for example, as 55547209 + 16511222016 = 7453^2 + 128496^2 .

It is not a de Polignac number, because 16566769225 - 2¹⁵ = 16566736457 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 331335360 + ... + 331335409.

Almost surely, 2^16566769225 is an apocalyptic number.

It is an amenable number.

16566769225 is a deficient number, since it is larger than the sum of its proper divisors (3976024645).

16566769225 is an equidigital number, since it uses as much as digits as its factorization.

16566769225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662670779 (or 662670774 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 55.

The spelling of 16566769225 in words is "sixteen billion, five hundred sixty-six million, seven hundred sixty-nine thousand, two hundred twenty-five".