164403505 has 16 divisors (see below), whose sum is σ = 226312704. Its totient is φ = 112311360.

The previous prime is 164403497. The next prime is 164403541. The reversal of 164403505 is 505304461.

It is not a de Polignac number, because 164403505 - 2³ = 164403497 is a prime.

It is a super-3 number, since 3×164403505³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 819 + ... + 18151.

It is an arithmetic number, because the mean of its divisors is an integer number (14144544).

Almost surely, 2^164403505 is an apocalyptic number.

It is an amenable number.

164403505 is a deficient number, since it is larger than the sum of its proper divisors (61909199).

164403505 is a wasteful number, since it uses less digits than its factorization.

164403505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17616.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 164403505 is about 12821.9930198078. The cubic root of 164403505 is about 547.8189158283.

Adding to 164403505 its reverse (505304461), we get a palindrome (669707966).

The spelling of 164403505 in words is "one hundred sixty-four million, four hundred three thousand, five hundred five".