165135043 has 4 divisors (see below), whose sum is σ = 167225440. Its totient is φ = 163044648.

The previous prime is 165135037. The next prime is 165135067. The reversal of 165135043 is 340531561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 340531561 = 809 ⋅420929.

It is a cyclic number.

It is not a de Polignac number, because 165135043 - 2⁵ = 165135011 is a prime.

It is a super-2 number, since 2×165135043² = 54539164853223698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165135013) 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, 1045080 + ... + 1045237.

It is an arithmetic number, because the mean of its divisors is an integer number (41806360).

Almost surely, 2^165135043 is an apocalyptic number.

165135043 is a deficient number, since it is larger than the sum of its proper divisors (2090397).

165135043 is an equidigital number, since it uses as much as digits as its factorization.

165135043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090396.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 165135043 is about 12850.4880452067. The cubic root of 165135043 is about 548.6302477188.

The spelling of 165135043 in words is "one hundred sixty-five million, one hundred thirty-five thousand, forty-three".