165623803 has 4 divisors (see below), whose sum is σ = 170100160. Its totient is φ = 161147448.

The previous prime is 165623789. The next prime is 165623813. The reversal of 165623803 is 308326561.

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 165623803 - 2⁹ = 165623291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165623813) 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, 2238123 + ... + 2238196.

It is an arithmetic number, because the mean of its divisors is an integer number (42525040).

Almost surely, 2^165623803 is an apocalyptic number.

165623803 is a deficient number, since it is larger than the sum of its proper divisors (4476357).

165623803 is an equidigital number, since it uses as much as digits as its factorization.

165623803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4476356.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 165623803 is about 12869.4911709826. The cubic root of 165623803 is about 549.1709857666.

The spelling of 165623803 in words is "one hundred sixty-five million, six hundred twenty-three thousand, eight hundred three".