494539640524789 has 2 divisors, whose sum is σ = 494539640524790. Its totient is φ = 494539640524788.

The previous prime is 494539640524753. The next prime is 494539640524807. The reversal of 494539640524789 is 987425046935494.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 480204769280625 + 14334871244164 = 21913575^2 + 3786142^2 .

It is a cyclic number.

It is not a de Polignac number, because 494539640524789 - 2⁹ = 494539640524277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (494539640564789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247269820262394 + 247269820262395.

It is an arithmetic number, because the mean of its divisors is an integer number (247269820262395).

Almost surely, 2^{494539640524789} is an apocalyptic number.

It is an amenable number.

494539640524789 is a deficient number, since it is larger than the sum of its proper divisors (1).

494539640524789 is an equidigital number, since it uses as much as digits as its factorization.

494539640524789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9405849600, while the sum is 79.

The spelling of 494539640524789 in words is "four hundred ninety-four trillion, five hundred thirty-nine billion, six hundred forty million, five hundred twenty-four thousand, seven hundred eighty-nine".