494641677721 has 4 divisors (see below), whose sum is σ = 495070682932. Its totient is φ = 494212672512.

The previous prime is 494641677713. The next prime is 494641677749. The reversal of 494641677721 is 127776146494.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 462929191321 + 31712486400 = 680389^2 + 178080^2 .

It is a cyclic number.

It is not a de Polignac number, because 494641677721 - 2³ = 494641677713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (494641677221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214500876 + ... + 214503181.

It is an arithmetic number, because the mean of its divisors is an integer number (123767670733).

Almost surely, 2^494641677721 is an apocalyptic number.

It is an amenable number.

494641677721 is a deficient number, since it is larger than the sum of its proper divisors (429005211).

494641677721 is a wasteful number, since it uses less digits than its factorization.

494641677721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429005210.

The product of its digits is 14224896, while the sum is 58.

The spelling of 494641677721 in words is "four hundred ninety-four billion, six hundred forty-one million, six hundred seventy-seven thousand, seven hundred twenty-one".