664437571136477 has 2 divisors, whose sum is σ = 664437571136478. Its totient is φ = 664437571136476.

The previous prime is 664437571136461. The next prime is 664437571136611. The reversal of 664437571136477 is 774631175734466.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 575584682891716 + 88852888244761 = 23991346^2 + 9426181^2 .

It is a cyclic number.

It is not a de Polignac number, because 664437571136477 - 2⁴ = 664437571136461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664437571136477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664437571136447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332218785568238 + 332218785568239.

It is an arithmetic number, because the mean of its divisors is an integer number (332218785568239).

Almost surely, 2^{664437571136477} is an apocalyptic number.

It is an amenable number.

664437571136477 is a deficient number, since it is larger than the sum of its proper divisors (1).

664437571136477 is an equidigital number, since it uses as much as digits as its factorization.

664437571136477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1493614080, while the sum is 71.

The spelling of 664437571136477 in words is "six hundred sixty-four trillion, four hundred thirty-seven billion, five hundred seventy-one million, one hundred thirty-six thousand, four hundred seventy-seven".