65961161129 has 2 divisors, whose sum is σ = 65961161130. Its totient is φ = 65961161128.

The previous prime is 65961161111. The next prime is 65961161143. The reversal of 65961161129 is 92116116956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55683256729 + 10277904400 = 235973^2 + 101380^2 .

It is a cyclic number.

It is not a de Polignac number, because 65961161129 - 2¹² = 65961157033 is a prime.

It is not a weakly prime, because it can be changed into another prime (65961166129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32980580564 + 32980580565.

It is an arithmetic number, because the mean of its divisors is an integer number (32980580565).

Almost surely, 2^65961161129 is an apocalyptic number.

It is an amenable number.

65961161129 is a deficient number, since it is larger than the sum of its proper divisors (1).

65961161129 is an equidigital number, since it uses as much as digits as its factorization.

65961161129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 47.

The spelling of 65961161129 in words is "sixty-five billion, nine hundred sixty-one million, one hundred sixty-one thousand, one hundred twenty-nine".