664581417287 has 2 divisors, whose sum is σ = 664581417288. Its totient is φ = 664581417286.

The previous prime is 664581417259. The next prime is 664581417317. The reversal of 664581417287 is 782714185466.

664581417287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664581417287 - 2²² = 664577222983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664581417187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332290708643 + 332290708644.

It is an arithmetic number, because the mean of its divisors is an integer number (332290708644).

Almost surely, 2^664581417287 is an apocalyptic number.

664581417287 is a deficient number, since it is larger than the sum of its proper divisors (1).

664581417287 is an equidigital number, since it uses as much as digits as its factorization.

664581417287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18063360, while the sum is 59.

The spelling of 664581417287 in words is "six hundred sixty-four billion, five hundred eighty-one million, four hundred seventeen thousand, two hundred eighty-seven".