664616662240601 has 16 divisors (see below), whose sum is σ = 776995988966400. Its totient is φ = 568250797665600.

The previous prime is 664616662240591. The next prime is 664616662240627. The reversal of 664616662240601 is 106042266616466.

It is not a de Polignac number, because 664616662240601 - 2¹⁰ = 664616662239577 is a prime.

It is a super-2 number, since 2×664616662240601² (a number of 30 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664616662240691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2415894761 + ... + 2416169846.

It is an arithmetic number, because the mean of its divisors is an integer number (48562249310400).

Almost surely, 2^{664616662240601} is an apocalyptic number.

It is an amenable number.

664616662240601 is a deficient number, since it is larger than the sum of its proper divisors (112379326725799).

664616662240601 is an equidigital number, since it uses as much as digits as its factorization.

664616662240601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4832065029 (or 4832065015 counting only the distinct ones).

The product of its (nonzero) digits is 17915904, while the sum is 56.

The spelling of 664616662240601 in words is "six hundred sixty-four trillion, six hundred sixteen billion, six hundred sixty-two million, two hundred forty thousand, six hundred one".