28318165691 has 2 divisors, whose sum is σ = 28318165692. Its totient is φ = 28318165690.

The previous prime is 28318165651. The next prime is 28318165723. The reversal of 28318165691 is 19656181382.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28318165691 is a prime.

It is not a weakly prime, because it can be changed into another prime (28318165651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14159082845 + 14159082846.

It is an arithmetic number, because the mean of its divisors is an integer number (14159082846).

Almost surely, 2^28318165691 is an apocalyptic number.

28318165691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28318165691 is an equidigital number, since it uses as much as digits as its factorization.

28318165691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 50.

The spelling of 28318165691 in words is "twenty-eight billion, three hundred eighteen million, one hundred sixty-five thousand, six hundred ninety-one".