664206515504565 has 48 divisors (see below), whose sum is σ = 1223571771003456. Its totient is φ = 305090074080000.

The previous prime is 664206515504561. The next prime is 664206515504599. The reversal of 664206515504565 is 565405515602466.

It is not a de Polignac number, because 664206515504565 - 2² = 664206515504561 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664206515504499 and 664206515504508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664206515504561) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 5575416936 + ... + 5575536065.

It is an arithmetic number, because the mean of its divisors is an integer number (25491078562572).

Almost surely, 2^{664206515504565} is an apocalyptic number.

It is an amenable number.

664206515504565 is a deficient number, since it is larger than the sum of its proper divisors (559365255498891).

664206515504565 is a wasteful number, since it uses less digits than its factorization.

664206515504565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11150953058 (or 11150953039 counting only the distinct ones).

The product of its (nonzero) digits is 129600000, while the sum is 60.

The spelling of 664206515504565 in words is "six hundred sixty-four trillion, two hundred six billion, five hundred fifteen million, five hundred four thousand, five hundred sixty-five".