664144008025 has 24 divisors (see below), whose sum is σ = 850510920960. Its totient is φ = 514167730560.

The previous prime is 664144008019. The next prime is 664144008107. The reversal of 664144008025 is 520800441466.

It is not a de Polignac number, because 664144008025 - 2¹⁹ = 664143483737 is a prime.

It is a super-2 number, since 2×664144008025² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3070869 + ... + 3280018.

It is an arithmetic number, because the mean of its divisors is an integer number (35437955040).

Almost surely, 2^664144008025 is an apocalyptic number.

It is an amenable number.

664144008025 is a deficient number, since it is larger than the sum of its proper divisors (186366912935).

664144008025 is a wasteful number, since it uses less digits than its factorization.

664144008025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6351033 (or 6351028 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 40.

The spelling of 664144008025 in words is "six hundred sixty-four billion, one hundred forty-four million, eight thousand, twenty-five".