664581560708 has 24 divisors (see below), whose sum is σ = 1269637909848. Its totient is φ = 302528169216.

The previous prime is 664581560623. The next prime is 664581560723. The reversal of 664581560708 is 807065185466.

It can be written as a sum of positive squares in 4 ways, for example, as 783552064 + 663798008644 = 27992^2 + 814738^2 .

It is a super-2 number, since 2×664581560708² (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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87533291 + ... + 87540882.

It is an arithmetic number, because the mean of its divisors is an integer number (52901579577).

Almost surely, 2^664581560708 is an apocalyptic number.

It is an amenable number.

664581560708 is a deficient number, since it is larger than the sum of its proper divisors (605056349140).

664581560708 is a wasteful number, since it uses less digits than its factorization.

664581560708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175074263 (or 175074261 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 56.

The spelling of 664581560708 in words is "six hundred sixty-four billion, five hundred eighty-one million, five hundred sixty thousand, seven hundred eight".