494391706681 has 2 divisors, whose sum is σ = 494391706682. Its totient is φ = 494391706680.

The previous prime is 494391706673. The next prime is 494391706741. The reversal of 494391706681 is 186607193494.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 422214048400 + 72177658281 = 649780^2 + 268659^2 .

It is a cyclic number.

It is not a de Polignac number, because 494391706681 - 2³ = 494391706673 is a prime.

It is a super-2 number, since 2×494391706681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (494391706661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247195853340 + 247195853341.

It is an arithmetic number, because the mean of its divisors is an integer number (247195853341).

Almost surely, 2^494391706681 is an apocalyptic number.

It is an amenable number.

494391706681 is a deficient number, since it is larger than the sum of its proper divisors (1).

494391706681 is an equidigital number, since it uses as much as digits as its factorization.

494391706681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7838208, while the sum is 58.

The spelling of 494391706681 in words is "four hundred ninety-four billion, three hundred ninety-one million, seven hundred six thousand, six hundred eighty-one".