667726208225 has 12 divisors (see below), whose sum is σ = 837956169456. Its totient is φ = 527745049680.

The previous prime is 667726208209. The next prime is 667726208231. The reversal of 667726208225 is 522802627766.

It is not a de Polignac number, because 667726208225 - 2⁴ = 667726208209 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 160895807 + ... + 160899956.

It is an arithmetic number, because the mean of its divisors is an integer number (69829680788).

Almost surely, 2^667726208225 is an apocalyptic number.

It is an amenable number.

667726208225 is a deficient number, since it is larger than the sum of its proper divisors (170229961231).

667726208225 is a wasteful number, since it uses less digits than its factorization.

667726208225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321795856 (or 321795851 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 53.

The spelling of 667726208225 in words is "six hundred sixty-seven billion, seven hundred twenty-six million, two hundred eight thousand, two hundred twenty-five".