164421506 has 16 divisors (see below), whose sum is σ = 251542368. Its totient is φ = 80589600.

The previous prime is 164421493. The next prime is 164421511. The reversal of 164421506 is 605124461.

It is a super-3 number, since 3×164421506³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17966 + ... + 25526.

It is an arithmetic number, because the mean of its divisors is an integer number (15721398).

Almost surely, 2^164421506 is an apocalyptic number.

164421506 is a deficient number, since it is larger than the sum of its proper divisors (87120862).

164421506 is a wasteful number, since it uses less digits than its factorization.

164421506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7777.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 164421506 is about 12822.6949585491. The cubic root of 164421506 is about 547.8389091742.

Adding to 164421506 its reverse (605124461), we get a palindrome (769545967).

The spelling of 164421506 in words is "one hundred sixty-four million, four hundred twenty-one thousand, five hundred six".