664581416903 has 2 divisors, whose sum is σ = 664581416904. Its totient is φ = 664581416902.

The previous prime is 664581416893. The next prime is 664581416951. The reversal of 664581416903 is 309614185466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664581416903 - 2¹⁴ = 664581400519 is a prime.

It is a super-2 number, since 2×664581416903² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664581410903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332290708451 + 332290708452.

It is an arithmetic number, because the mean of its divisors is an integer number (332290708452).

Almost surely, 2^664581416903 is an apocalyptic number.

664581416903 is a deficient number, since it is larger than the sum of its proper divisors (1).

664581416903 is an equidigital number, since it uses as much as digits as its factorization.

664581416903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3732480, while the sum is 53.

The spelling of 664581416903 in words is "six hundred sixty-four billion, five hundred eighty-one million, four hundred sixteen thousand, nine hundred three".