165688043 has 4 divisors (see below), whose sum is σ = 167785440. Its totient is φ = 163590648.

The previous prime is 165688031. The next prime is 165688051. The reversal of 165688043 is 340886561.

165688043 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165688043 - 2⁸ = 165687787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165688013) 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, 1048580 + ... + 1048737.

It is an arithmetic number, because the mean of its divisors is an integer number (41946360).

Almost surely, 2^165688043 is an apocalyptic number.

165688043 is a deficient number, since it is larger than the sum of its proper divisors (2097397).

165688043 is an equidigital number, since it uses as much as digits as its factorization.

165688043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097396.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 165688043 is about 12871.9867541883. The cubic root of 165688043 is about 549.2419783480.

The spelling of 165688043 in words is "one hundred sixty-five million, six hundred eighty-eight thousand, forty-three".