165551003 has 4 divisors (see below), whose sum is σ = 165579288. Its totient is φ = 165522720.

The previous prime is 165550951. The next prime is 165551017. The reversal of 165551003 is 300155561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 300155561 = 17317 ⋅17333.

It is a cyclic number.

It is not a de Polignac number, because 165551003 - 2¹² = 165546907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165551063) 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, 1733 + ... + 18278.

It is an arithmetic number, because the mean of its divisors is an integer number (41394822).

Almost surely, 2^165551003 is an apocalyptic number.

165551003 is a deficient number, since it is larger than the sum of its proper divisors (28285).

165551003 is an equidigital number, since it uses as much as digits as its factorization.

165551003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28284.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 165551003 is about 12866.6624654570. The cubic root of 165551003 is about 549.0905112088.

The spelling of 165551003 in words is "one hundred sixty-five million, five hundred fifty-one thousand, three".