65816261689 has 2 divisors, whose sum is σ = 65816261690. Its totient is φ = 65816261688.

The previous prime is 65816261683. The next prime is 65816261737. The reversal of 65816261689 is 98616261856.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50814176400 + 15002085289 = 225420^2 + 122483^2 .

It is a cyclic number.

It is not a de Polignac number, because 65816261689 - 2⁵ = 65816261657 is a prime.

It is not a weakly prime, because it can be changed into another prime (65816261683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32908130844 + 32908130845.

It is an arithmetic number, because the mean of its divisors is an integer number (32908130845).

Almost surely, 2^65816261689 is an apocalyptic number.

It is an amenable number.

65816261689 is a deficient number, since it is larger than the sum of its proper divisors (1).

65816261689 is an equidigital number, since it uses as much as digits as its factorization.

65816261689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7464960, while the sum is 58.

The spelling of 65816261689 in words is "sixty-five billion, eight hundred sixteen million, two hundred sixty-one thousand, six hundred eighty-nine".