664841535656 has 32 divisors (see below), whose sum is σ = 1251877667040. Its totient is φ = 331009639488.

The previous prime is 664841535647. The next prime is 664841535671. The reversal of 664841535656 is 656535148466.

It is a super-3 number, since 3×664841535656³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664841535595 and 664841535604.

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 7 ways as a sum of consecutive naturals, for example, 2354315 + ... + 2621541.

It is an arithmetic number, because the mean of its divisors is an integer number (39121177095).

Almost surely, 2^664841535656 is an apocalyptic number.

It is an amenable number.

664841535656 is a deficient number, since it is larger than the sum of its proper divisors (587036131384).

664841535656 is a wasteful number, since it uses less digits than its factorization.

664841535656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268553 (or 268549 counting only the distinct ones).

The product of its digits is 62208000, while the sum is 59.

The spelling of 664841535656 in words is "six hundred sixty-four billion, eight hundred forty-one million, five hundred thirty-five thousand, six hundred fifty-six".