664124605 has 4 divisors (see below), whose sum is σ = 796949532. Its totient is φ = 531299680.

The previous prime is 664124561. The next prime is 664124611. The reversal of 664124605 is 506421466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91431844 + 572692761 = 9562^2 + 23931^2 .

It is not a de Polignac number, because 664124605 - 2⁷ = 664124477 is a prime.

It is a super-2 number, since 2×664124605² = 882122981932812050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 66412456 + ... + 66412465.

It is an arithmetic number, because the mean of its divisors is an integer number (199237383).

Almost surely, 2^664124605 is an apocalyptic number.

It is an amenable number.

664124605 is a deficient number, since it is larger than the sum of its proper divisors (132824927).

664124605 is a wasteful number, since it uses less digits than its factorization.

664124605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132824926.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 664124605 is about 25770.6151459370. The cubic root of 664124605 is about 872.4687027468.

It can be divided in two parts, 66412 and 4605, that added together give a palindrome (71017).

The spelling of 664124605 in words is "six hundred sixty-four million, one hundred twenty-four thousand, six hundred five".