664615447354025 has 48 divisors (see below), whose sum is σ = 856981043869440. Its totient is φ = 511032871065600.

The previous prime is 664615447354021. The next prime is 664615447354037. The reversal of 664615447354025 is 520453744516466.

It is a happy number.

It is not a de Polignac number, because 664615447354025 - 2² = 664615447354021 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664615447354021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16750139 + ... + 40122288.

It is an arithmetic number, because the mean of its divisors is an integer number (17853771747280).

Almost surely, 2^{664615447354025} is an apocalyptic number.

It is an amenable number.

664615447354025 is a deficient number, since it is larger than the sum of its proper divisors (192365596515415).

664615447354025 is a wasteful number, since it uses less digits than its factorization.

664615447354025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56872674 (or 56872669 counting only the distinct ones).

The product of its (nonzero) digits is 290304000, while the sum is 62.

The spelling of 664615447354025 in words is "six hundred sixty-four trillion, six hundred fifteen billion, four hundred forty-seven million, three hundred fifty-four thousand, twenty-five".