165223811 has 2 divisors, whose sum is σ = 165223812. Its totient is φ = 165223810.

The previous prime is 165223801. The next prime is 165223813. The reversal of 165223811 is 118322561.

165223811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165223811 is a prime.

Together with 165223813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165223813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82611905 + 82611906.

It is an arithmetic number, because the mean of its divisors is an integer number (82611906).

Almost surely, 2^165223811 is an apocalyptic number.

165223811 is a deficient number, since it is larger than the sum of its proper divisors (1).

165223811 is an equidigital number, since it uses as much as digits as its factorization.

165223811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 29.

The square root of 165223811 is about 12853.9414577786. The cubic root of 165223811 is about 548.7285351269.

The spelling of 165223811 in words is "one hundred sixty-five million, two hundred twenty-three thousand, eight hundred eleven".