165541423 has 2 divisors, whose sum is σ = 165541424. Its totient is φ = 165541422.

The previous prime is 165541391. The next prime is 165541447. The reversal of 165541423 is 324145561.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165541423 - 2⁵ = 165541391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165541463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82770711 + 82770712.

It is an arithmetic number, because the mean of its divisors is an integer number (82770712).

Almost surely, 2^165541423 is an apocalyptic number.

165541423 is a deficient number, since it is larger than the sum of its proper divisors (1).

165541423 is an equidigital number, since it uses as much as digits as its factorization.

165541423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 31.

The square root of 165541423 is about 12866.2901801568. The cubic root of 165541423 is about 549.0799195312.

Adding to 165541423 its reverse (324145561), we get a palindrome (489686984).

The spelling of 165541423 in words is "one hundred sixty-five million, five hundred forty-one thousand, four hundred twenty-three".