413681812561 has 2 divisors, whose sum is σ = 413681812562. Its totient is φ = 413681812560.

The previous prime is 413681812553. The next prime is 413681812619. The reversal of 413681812561 is 165218186314.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 411722422336 + 1959390225 = 641656^2 + 44265^2 .

It is a cyclic number.

It is not a de Polignac number, because 413681812561 - 2³ = 413681812553 is a prime.

It is a super-2 number, since 2×413681812561² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (413681812541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 206840906280 + 206840906281.

It is an arithmetic number, because the mean of its divisors is an integer number (206840906281).

Almost surely, 2^413681812561 is an apocalyptic number.

It is an amenable number.

413681812561 is a deficient number, since it is larger than the sum of its proper divisors (1).

413681812561 is an equidigital number, since it uses as much as digits as its factorization.

413681812561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 46.

Adding to 413681812561 its reverse (165218186314), we get a palindrome (578899998875).

The spelling of 413681812561 in words is "four hundred thirteen billion, six hundred eighty-one million, eight hundred twelve thousand, five hundred sixty-one".