6686387498025 has 243 divisors, whose sum is σ = 13001955062967. Its totient is φ = 3284179214400.

The previous prime is 6686387498017. The next prime is 6686387498029. The reversal of 6686387498025 is 5208947836866.

The square root of 6686387498025 is 2585805.

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

6686387498025 is a `hidden beast` number, since 6 + 6 + 86 + 38 + 7 + 498 + 0 + 25 = 666.

6686387498025 is digitally balanced in base 3, 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 only one way, i.e., 2407099499289 + 4279287998736 = 1551483^2 + 2068644^2 .

It is not a de Polignac number, because 6686387498025 - 2³ = 6686387498017 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6686387498029) by changing a digit.

It is a polite number, since it can be written in 242 ways as a sum of consecutive naturals, for example, 31689040170 + ... + 31689040380.

Almost surely, 2^{6686387498025} is an apocalyptic number.

6686387498025 is the 2585805-th square number.

6686387498025 is the 1292903-rd centered octagonal number.

It is an amenable number.

6686387498025 is a deficient number, since it is larger than the sum of its proper divisors (6315567564942).

6686387498025 is a wasteful number, since it uses less digits than its factorization.

6686387498025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 836075520, while the sum is 72.

The spelling of 6686387498025 in words is "six trillion, six hundred eighty-six billion, three hundred eighty-seven million, four hundred ninety-eight thousand, twenty-five".