164243384870665 has 8 divisors (see below), whose sum is σ = 198900245899080. Its totient is φ = 130189251860352.

The previous prime is 164243384870629. The next prime is 164243384870681. The reversal of 164243384870665 is 566078483342461.

It can be written as a sum of positive squares in 4 ways, for example, as 30475169466624 + 133768215404041 = 5520432^2 + 11565821^2 .

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 164243384870665 - 2⁴⁵ = 129059012781833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 164243384870665.

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, 150682003924 + ... + 150682005013.

It is an arithmetic number, because the mean of its divisors is an integer number (24862530737385).

Almost surely, 2^{164243384870665} is an apocalyptic number.

It is an amenable number.

164243384870665 is a deficient number, since it is larger than the sum of its proper divisors (34656861028415).

164243384870665 is a wasteful number, since it uses less digits than its factorization.

164243384870665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301364009051.

The product of its (nonzero) digits is 557383680, while the sum is 67.

The spelling of 164243384870665 in words is "one hundred sixty-four trillion, two hundred forty-three billion, three hundred eighty-four million, eight hundred seventy thousand, six hundred sixty-five".