65151661661 has 2 divisors, whose sum is σ = 65151661662. Its totient is φ = 65151661660.

The previous prime is 65151661651. The next prime is 65151661669. The reversal of 65151661661 is 16616615156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49421736100 + 15729925561 = 222310^2 + 125419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65151661661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65151661669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32575830830 + 32575830831.

It is an arithmetic number, because the mean of its divisors is an integer number (32575830831).

Almost surely, 2^65151661661 is an apocalyptic number.

It is an amenable number.

65151661661 is a deficient number, since it is larger than the sum of its proper divisors (1).

65151661661 is an equidigital number, since it uses as much as digits as its factorization.

65151661661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 44.

The spelling of 65151661661 in words is "sixty-five billion, one hundred fifty-one million, six hundred sixty-one thousand, six hundred sixty-one".