494555018681 has 2 divisors, whose sum is σ = 494555018682. Its totient is φ = 494555018680.

The previous prime is 494555018641. The next prime is 494555018717. The reversal of 494555018681 is 186810555494.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 300654822400 + 193900196281 = 548320^2 + 440341^2 .

It is a cyclic number.

It is not a de Polignac number, because 494555018681 - 2¹⁴ = 494555002297 is a prime.

It is a super-2 number, since 2×494555018681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (494555018641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247277509340 + 247277509341.

It is an arithmetic number, because the mean of its divisors is an integer number (247277509341).

Almost surely, 2^494555018681 is an apocalyptic number.

It is an amenable number.

494555018681 is a deficient number, since it is larger than the sum of its proper divisors (1).

494555018681 is an equidigital number, since it uses as much as digits as its factorization.

494555018681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912000, while the sum is 56.

The spelling of 494555018681 in words is "four hundred ninety-four billion, five hundred fifty-five million, eighteen thousand, six hundred eighty-one".