664447140164225 has 48 divisors (see below), whose sum is σ = 936480945954816. Its totient is φ = 463275556296000.

The previous prime is 664447140164207. The next prime is 664447140164237. The reversal of 664447140164225 is 522461041744466.

664447140164225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664447140164225 - 2⁸ = 664447140163969 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 363298169 + ... + 365122518.

It is an arithmetic number, because the mean of its divisors is an integer number (19510019707392).

Almost surely, 2^{664447140164225} is an apocalyptic number.

It is an amenable number.

664447140164225 is a deficient number, since it is larger than the sum of its proper divisors (272033805790591).

664447140164225 is a wasteful number, since it uses less digits than its factorization.

664447140164225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728420846 (or 728420841 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 56.

The spelling of 664447140164225 in words is "six hundred sixty-four trillion, four hundred forty-seven billion, one hundred forty million, one hundred sixty-four thousand, two hundred twenty-five".