6699664125 has 288 divisors, whose sum is σ = 15536102400. Its totient is φ = 2718144000.

The previous prime is 6699664123. The next prime is 6699664159. The reversal of 6699664125 is 5214669966.

It is not a de Polignac number, because 6699664125 - 2¹ = 6699664123 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6699664123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 75277081 + ... + 75277169.

It is an arithmetic number, because the mean of its divisors is an integer number (53944800).

Almost surely, 2^6699664125 is an apocalyptic number.

It is an amenable number.

6699664125 is an abundant number, since it is smaller than the sum of its proper divisors (8836438275).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6699664125 is a wasteful number, since it uses less digits than its factorization.

6699664125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 194 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The square root of 6699664125 is about 81851.4760099047. The cubic root of 6699664125 is about 1885.1721283667.

The spelling of 6699664125 in words is "six billion, six hundred ninety-nine million, six hundred sixty-four thousand, one hundred twenty-five".