164621111 has 8 divisors (see below), whose sum is σ = 173980800. Its totient is φ = 155331000.

The previous prime is 164621101. The next prime is 164621117. The reversal of 164621111 is 111126461.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 164621111 - 2¹⁰ = 164620087 is a prime.

It is a super-5 number, since 5×164621111⁵ (a number of 42 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164621117) 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 7 ways as a sum of consecutive naturals, for example, 12491 + ... + 22028.

It is an arithmetic number, because the mean of its divisors is an integer number (21747600).

Almost surely, 2^164621111 is an apocalyptic number.

164621111 is a deficient number, since it is larger than the sum of its proper divisors (9359689).

164621111 is a wasteful number, since it uses less digits than its factorization.

164621111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34789.

The product of its digits is 288, while the sum is 23.

The square root of 164621111 is about 12830.4758680261. The cubic root of 164621111 is about 548.0605086630.

Adding to 164621111 its reverse (111126461), we get a palindrome (275747572).

The spelling of 164621111 in words is "one hundred sixty-four million, six hundred twenty-one thousand, one hundred eleven".