16610566625 has 8 divisors (see below), whose sum is σ = 20729987304. Its totient is φ = 13288453200.

The previous prime is 16610566619. The next prime is 16610566717. The reversal of 16610566625 is 52666501661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1823033809 + 14787532816 = 42697^2 + 121604^2 .

It is not a de Polignac number, because 16610566625 - 2¹⁸ = 16610304481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66442142 + ... + 66442391.

It is an arithmetic number, because the mean of its divisors is an integer number (2591248413).

Almost surely, 2^16610566625 is an apocalyptic number.

It is an amenable number.

16610566625 is a deficient number, since it is larger than the sum of its proper divisors (4119420679).

16610566625 is an equidigital number, since it uses as much as digits as its factorization.

16610566625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132884548 (or 132884538 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 16610566625 in words is "sixteen billion, six hundred ten million, five hundred sixty-six thousand, six hundred twenty-five".