65602106681 has 2 divisors, whose sum is σ = 65602106682. Its totient is φ = 65602106680.

The previous prime is 65602106663. The next prime is 65602106693. The reversal of 65602106681 is 18660120656.

It is a happy number.

65602106681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41785901056 + 23816205625 = 204416^2 + 154325^2 .

It is a cyclic number.

It is not a de Polignac number, because 65602106681 - 2³⁴ = 48422237497 is a prime.

It is a super-2 number, since 2×65602106681² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (65602106651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32801053340 + 32801053341.

It is an arithmetic number, because the mean of its divisors is an integer number (32801053341).

Almost surely, 2^65602106681 is an apocalyptic number.

It is an amenable number.

65602106681 is a deficient number, since it is larger than the sum of its proper divisors (1).

65602106681 is an equidigital number, since it uses as much as digits as its factorization.

65602106681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 65602106681 in words is "sixty-five billion, six hundred two million, one hundred six thousand, six hundred eighty-one".