6681610225 has 12 divisors (see below), whose sum is σ = 8286597724. Its totient is φ = 5344384320.

The previous prime is 6681610219. The next prime is 6681610231. The reversal of 6681610225 is 5220161866.

It is an interprime number because it is at equal distance from previous prime (6681610219) and next prime (6681610231).

It can be written as a sum of positive squares in 6 ways, for example, as 638724529 + 6042885696 = 25273^2 + 77736^2 .

It is not a de Polignac number, because 6681610225 - 2¹¹ = 6681608177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155827 + ... + 194023.

Almost surely, 2^6681610225 is an apocalyptic number.

It is an amenable number.

6681610225 is a deficient number, since it is larger than the sum of its proper divisors (1604987499).

6681610225 is a wasteful number, since it uses less digits than its factorization.

6681610225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45204 (or 45199 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 6681610225 is about 81741.1171014931. The cubic root of 6681610225 is about 1883.4772510342.

The spelling of 6681610225 in words is "six billion, six hundred eighty-one million, six hundred ten thousand, two hundred twenty-five".