664702125647013 has 12 divisors (see below), whose sum is σ = 970913217238380. Its totient is φ = 438155708291136.

The previous prime is 664702125646957. The next prime is 664702125647057. The reversal of 664702125647013 is 310746521207466.

664702125647013 is a `hidden beast` number, since 6 + 6 + 4 + 7 + 0 + 2 + 1 + 2 + 564 + 70 + 1 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 442421667927684 + 222280457719329 = 21033822^2 + 14909073^2 .

It is not a de Polignac number, because 664702125647013 - 2¹² = 664702125642917 is a prime.

It is a super-6 number, since 6×664702125647013⁶ (a number of 90 digits) contains 666666 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664702125687013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 414920177506 + ... + 414920179107.

It is an arithmetic number, because the mean of its divisors is an integer number (80909434769865).

Almost surely, 2^{664702125647013} is an apocalyptic number.

It is an amenable number.

664702125647013 is a deficient number, since it is larger than the sum of its proper divisors (306211091591367).

664702125647013 is a wasteful number, since it uses less digits than its factorization.

664702125647013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829840356708 (or 829840356705 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 54.

The spelling of 664702125647013 in words is "six hundred sixty-four trillion, seven hundred two billion, one hundred twenty-five million, six hundred forty-seven thousand, thirteen".