659417371681 has 4 divisors (see below), whose sum is σ = 659425276692. Its totient is φ = 659409466672.

The previous prime is 659417371673. The next prime is 659417371727. The reversal of 659417371681 is 186173714956.

It is a happy number.

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 294892441600 + 364524930081 = 543040^2 + 603759^2 .

It is a cyclic number.

It is not a de Polignac number, because 659417371681 - 2³ = 659417371673 is a prime.

It is a super-2 number, since 2×659417371681² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (659417371981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3826030 + ... + 3994663.

It is an arithmetic number, because the mean of its divisors is an integer number (164856319173).

Almost surely, 2^659417371681 is an apocalyptic number.

It is an amenable number.

659417371681 is a deficient number, since it is larger than the sum of its proper divisors (7905011).

659417371681 is an equidigital number, since it uses as much as digits as its factorization.

659417371681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7905010.

The product of its digits is 7620480, while the sum is 58.

The spelling of 659417371681 in words is "six hundred fifty-nine billion, four hundred seventeen million, three hundred seventy-one thousand, six hundred eighty-one".