605736880681 has 9 divisors (see below), whose sum is σ = 613188236311. Its totient is φ = 598375026112.

The previous prime is 605736880673. The next prime is 605736880699. The reversal of 605736880681 is 186088637506.

The square root of 605736880681 is 778291.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 66417021225 + 539319859456 = 257715^2 + 734384^2 .

It is not a de Polignac number, because 605736880681 - 2³ = 605736880673 is a prime.

It is a super-2 number, since 2×605736880681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (605736880601) 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 in 8 ways as a sum of consecutive naturals, for example, 64593465 + ... + 64602841.

Almost surely, 2^605736880681 is an apocalyptic number.

605736880681 is the 778291-st square number.

605736880681 is the 389146-th centered octagonal number.

It is an amenable number.

605736880681 is a deficient number, since it is larger than the sum of its proper divisors (7451355630).

605736880681 is an frugal number, since it uses more digits than its factorization.

605736880681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18920 (or 9460 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 58.

The spelling of 605736880681 in words is "six hundred five billion, seven hundred thirty-six million, eight hundred eighty thousand, six hundred eighty-one".