164216541985 has 8 divisors (see below), whose sum is σ = 197089851816. Its totient is φ = 131353232640.

The previous prime is 164216541943. The next prime is 164216541989. The reversal of 164216541985 is 589145612461.

It can be written as a sum of positive squares in 4 ways, for example, as 102221517841 + 61995024144 = 319721^2 + 248988^2 .

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

It is not a de Polignac number, because 164216541985 - 2¹¹ = 164216539937 is a prime.

It is a super-2 number, since 2×164216541985² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164216541989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2463946 + ... + 2529715.

It is an arithmetic number, because the mean of its divisors is an integer number (24636231477).

Almost surely, 2^164216541985 is an apocalyptic number.

It is an amenable number.

164216541985 is a deficient number, since it is larger than the sum of its proper divisors (32873309831).

164216541985 is an equidigital number, since it uses as much as digits as its factorization.

164216541985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000243.

The product of its digits is 2073600, while the sum is 52.

The spelling of 164216541985 in words is "one hundred sixty-four billion, two hundred sixteen million, five hundred forty-one thousand, nine hundred eighty-five".