6688786225 has 27 divisors (see below), whose sum is σ = 9122784811. Its totient is φ = 4861300400.

The previous prime is 6688786219. The next prime is 6688786249. The reversal of 6688786225 is 5226878866.

The square root of 6688786225 is 81785.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2407963041 + 4280823184 = 49071^2 + 65428^2 .

It is not a de Polignac number, because 6688786225 - 2³ = 6688786217 is a prime.

It is a super-2 number, since 2×6688786225² = 89479722327499501250, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6688786225.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4497432 + ... + 4498918.

Almost surely, 2^6688786225 is an apocalyptic number.

6688786225 is the 81785-th square number.

6688786225 is the 40893-rd centered octagonal number.

It is an amenable number.

6688786225 is a deficient number, since it is larger than the sum of its proper divisors (2433998586).

6688786225 is an equidigital number, since it uses as much as digits as its factorization.

6688786225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3006 (or 1503 counting only the distinct ones).

The product of its digits is 15482880, while the sum is 58.

The cubic root of 6688786225 is about 1884.1512900033.

The spelling of 6688786225 in words is "six billion, six hundred eighty-eight million, seven hundred eighty-six thousand, two hundred twenty-five".