16566634625 has 8 divisors (see below), whose sum is σ = 20675160168. Its totient is φ = 13253307600.

The previous prime is 16566634613. The next prime is 16566634687. The reversal of 16566634625 is 52643666561.

16566634625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 719097856 + 15847536769 = 26816^2 + 125887^2 .

It is not a de Polignac number, because 16566634625 - 2⁸ = 16566634369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66266414 + ... + 66266663.

It is an arithmetic number, because the mean of its divisors is an integer number (2584395021).

Almost surely, 2^16566634625 is an apocalyptic number.

It is an amenable number.

16566634625 is a deficient number, since it is larger than the sum of its proper divisors (4108525543).

16566634625 is an equidigital number, since it uses as much as digits as its factorization.

16566634625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132533092 (or 132533082 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 50.

The spelling of 16566634625 in words is "sixteen billion, five hundred sixty-six million, six hundred thirty-four thousand, six hundred twenty-five".