664555424555466 has 48 divisors (see below), whose sum is σ = 1480708493464200. Its totient is φ = 215251213860864.

The previous prime is 664555424555441. The next prime is 664555424555471.

It is a happy number.

664555424555466 is a `hidden beast` number, since 6 + 6 + 4 + 5 + 5 + 5 + 4 + 2 + 4 + 5 + 554 + 66 = 666.

664555424555466 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 630707219793225 + 33848204762241 = 25113885^2 + 5817921^2 .

It is a junction number, because it is equal to n+sod(n) for n = 664555424555394 and 664555424555403.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 648272611 + ... + 649296918.

Almost surely, 2^{664555424555466} is an apocalyptic number.

664555424555466 is an abundant number, since it is smaller than the sum of its proper divisors (816153068908734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664555424555466 is a wasteful number, since it uses less digits than its factorization.

664555424555466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297570343 (or 1297570340 counting only the distinct ones).

The product of its digits is 10368000000, while the sum is 72.

The spelling of 664555424555466 in words is "six hundred sixty-four trillion, five hundred fifty-five billion, four hundred twenty-four million, five hundred fifty-five thousand, four hundred sixty-six".