664988752705 has 16 divisors (see below), whose sum is σ = 833076723600. Its totient is φ = 508934119680.

The previous prime is 664988752691. The next prime is 664988752819. The reversal of 664988752705 is 507257889466.

It can be written as a sum of positive squares in 8 ways, for example, as 776792641 + 664211960064 = 27871^2 + 814992^2 .

It is not a de Polignac number, because 664988752705 - 2⁹ = 664988752193 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 21021486 + ... + 21053095.

It is an arithmetic number, because the mean of its divisors is an integer number (52067295225).

Almost surely, 2^664988752705 is an apocalyptic number.

It is an amenable number.

664988752705 is a deficient number, since it is larger than the sum of its proper divisors (168087970895).

664988752705 is a wasteful number, since it uses less digits than its factorization.

664988752705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42074724.

The product of its (nonzero) digits is 203212800, while the sum is 67.

The spelling of 664988752705 in words is "six hundred sixty-four billion, nine hundred eighty-eight million, seven hundred fifty-two thousand, seven hundred five".