664843287658 has 64 divisors (see below), whose sum is σ = 1173425932800. Its totient is φ = 279254122560.

The previous prime is 664843287613. The next prime is 664843287671. The reversal of 664843287658 is 856782348466.

It is a junction number, because it is equal to n+sod(n) for n = 664843287593 and 664843287602.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13257760 + ... + 13307812.

It is an arithmetic number, because the mean of its divisors is an integer number (18334780200).

Almost surely, 2^664843287658 is an apocalyptic number.

664843287658 is a deficient number, since it is larger than the sum of its proper divisors (508582645142).

664843287658 is a wasteful number, since it uses less digits than its factorization.

664843287658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50867.

The product of its digits is 371589120, while the sum is 67.

The spelling of 664843287658 in words is "six hundred sixty-four billion, eight hundred forty-three million, two hundred eighty-seven thousand, six hundred fifty-eight".