165422813 has 2 divisors, whose sum is σ = 165422814. Its totient is φ = 165422812.

The previous prime is 165422791. The next prime is 165422821. The reversal of 165422813 is 318224561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152448409 + 12974404 = 12347^2 + 3602^2 .

It is a cyclic number.

It is not a de Polignac number, because 165422813 - 2¹⁴ = 165406429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165422813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165422833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82711406 + 82711407.

It is an arithmetic number, because the mean of its divisors is an integer number (82711407).

Almost surely, 2^165422813 is an apocalyptic number.

It is an amenable number.

165422813 is a deficient number, since it is larger than the sum of its proper divisors (1).

165422813 is an equidigital number, since it uses as much as digits as its factorization.

165422813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

The square root of 165422813 is about 12861.6800224543. The cubic root of 165422813 is about 548.9487500862.

The spelling of 165422813 in words is "one hundred sixty-five million, four hundred twenty-two thousand, eight hundred thirteen".