164821506 has 8 divisors (see below), whose sum is σ = 329643024. Its totient is φ = 54940500.

The previous prime is 164821499. The next prime is 164821507. The reversal of 164821506 is 605128461.

It is a sphenic number, since it is the product of 3 distinct primes.

164821506 is an admirable number.

It is a super-2 number, since 2×164821506² = 54332257680216072, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (164821507) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13735120 + ... + 13735131.

It is an arithmetic number, because the mean of its divisors is an integer number (41205378).

Almost surely, 2^164821506 is an apocalyptic number.

164821506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

164821506 is a wasteful number, since it uses less digits than its factorization.

164821506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27470256.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 164821506 is about 12838.2828291014. The cubic root of 164821506 is about 548.2828050824.

Adding to 164821506 its reverse (605128461), we get a palindrome (769949967).

The spelling of 164821506 in words is "one hundred sixty-four million, eight hundred twenty-one thousand, five hundred six".