165898043 has 4 divisors (see below), whose sum is σ = 167448600. Its totient is φ = 164347488.

The previous prime is 165898027. The next prime is 165898069. The reversal of 165898043 is 340898561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 340898561 = 61 ⋅5588501.

It is a cyclic number.

It is not a de Polignac number, because 165898043 - 2⁴ = 165898027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165897985 and 165898003.

It is not an unprimeable number, because it can be changed into a prime (165898093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 775118 + ... + 775331.

It is an arithmetic number, because the mean of its divisors is an integer number (41862150).

Almost surely, 2^165898043 is an apocalyptic number.

165898043 is a deficient number, since it is larger than the sum of its proper divisors (1550557).

165898043 is a wasteful number, since it uses less digits than its factorization.

165898043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550556.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 165898043 is about 12880.1414200311. The cubic root of 165898043 is about 549.4739245170.

The spelling of 165898043 in words is "one hundred sixty-five million, eight hundred ninety-eight thousand, forty-three".