664838668485 has 24 divisors (see below), whose sum is σ = 1153180247544. Its totient is φ = 354336554880.

The previous prime is 664838668477. The next prime is 664838668499. The reversal of 664838668485 is 584866838466.

664838668485 is a `hidden beast` number, since 6 + 6 + 4 + 8 + 3 + 86 + 68 + 485 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 43514794404 + 621323874081 = 208602^2 + 788241^2 .

It is not a de Polignac number, because 664838668485 - 2³ = 664838668477 is a prime.

It is a super-2 number, since 2×664838668485² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5018646 + ... + 5149415.

It is an arithmetic number, because the mean of its divisors is an integer number (48049176981).

Almost surely, 2^664838668485 is an apocalyptic number.

It is an amenable number.

664838668485 is a deficient number, since it is larger than the sum of its proper divisors (488341579059).

664838668485 is a wasteful number, since it uses less digits than its factorization.

664838668485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10169525 (or 10169522 counting only the distinct ones).

The product of its digits is 1274019840, while the sum is 72.

The spelling of 664838668485 in words is "six hundred sixty-four billion, eight hundred thirty-eight million, six hundred sixty-eight thousand, four hundred eighty-five".