165442427 has 4 divisors (see below), whose sum is σ = 172635600. Its totient is φ = 158249256.

The previous prime is 165442423. The next prime is 165442439. The reversal of 165442427 is 724244561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 724244561 = 179 ⋅4046059.

It is a cyclic number.

It is not a de Polignac number, because 165442427 - 2² = 165442423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165442423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3596552 + ... + 3596597.

It is an arithmetic number, because the mean of its divisors is an integer number (43158900).

Almost surely, 2^165442427 is an apocalyptic number.

165442427 is a deficient number, since it is larger than the sum of its proper divisors (7193173).

165442427 is an equidigital number, since it uses as much as digits as its factorization.

165442427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7193172.

The product of its digits is 53760, while the sum is 35.

The square root of 165442427 is about 12862.4424974419. The cubic root of 165442427 is about 548.9704453108.

Adding to 165442427 its reverse (724244561), we get a palindrome (889686988).

The spelling of 165442427 in words is "one hundred sixty-five million, four hundred forty-two thousand, four hundred twenty-seven".