165142243 has 16 divisors (see below), whose sum is σ = 199352320. Its totient is φ = 133638336.

The previous prime is 165142193. The next prime is 165142247. The reversal of 165142243 is 342241561.

It is a cyclic number.

It is not a de Polignac number, because 165142243 - 2¹³ = 165134051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165142247) 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 in 15 ways as a sum of consecutive naturals, for example, 39646 + ... + 43612.

It is an arithmetic number, because the mean of its divisors is an integer number (12459520).

Almost surely, 2^165142243 is an apocalyptic number.

165142243 is a deficient number, since it is larger than the sum of its proper divisors (34210077).

165142243 is a wasteful number, since it uses less digits than its factorization.

165142243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4306.

The product of its digits is 5760, while the sum is 28.

The square root of 165142243 is about 12850.7681871552. The cubic root of 165142243 is about 548.6382211533.

The spelling of 165142243 in words is "one hundred sixty-five million, one hundred forty-two thousand, two hundred forty-three".