165533403 has 16 divisors (see below), whose sum is σ = 267079680. Its totient is φ = 89026176.

The previous prime is 165533383. The next prime is 165533419. The reversal of 165533403 is 304335561.

It is a happy number.

It is not a de Polignac number, because 165533403 - 2¹⁷ = 165402331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165533003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231483 + ... + 232196.

It is an arithmetic number, because the mean of its divisors is an integer number (16692480).

Almost surely, 2^165533403 is an apocalyptic number.

165533403 is a deficient number, since it is larger than the sum of its proper divisors (101546277).

165533403 is a wasteful number, since it uses less digits than its factorization.

165533403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463706.

The product of its (nonzero) digits is 16200, while the sum is 30.

The square root of 165533403 is about 12865.9785092312. The cubic root of 165533403 is about 549.0710522802.

Adding to 165533403 its reverse (304335561), we get a palindrome (469868964).

The spelling of 165533403 in words is "one hundred sixty-five million, five hundred thirty-three thousand, four hundred three".