165728806237 has 2 divisors, whose sum is σ = 165728806238. Its totient is φ = 165728806236.

The previous prime is 165728806207. The next prime is 165728806249. The reversal of 165728806237 is 732608827561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164105199801 + 1623606436 = 405099^2 + 40294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165728806237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165728806207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82864403118 + 82864403119.

It is an arithmetic number, because the mean of its divisors is an integer number (82864403119).

Almost surely, 2^165728806237 is an apocalyptic number.

It is an amenable number.

165728806237 is a deficient number, since it is larger than the sum of its proper divisors (1).

165728806237 is an equidigital number, since it uses as much as digits as its factorization.

165728806237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6773760, while the sum is 55.

The spelling of 165728806237 in words is "one hundred sixty-five billion, seven hundred twenty-eight million, eight hundred six thousand, two hundred thirty-seven".